Automatic pool cleaners are only as good as the filters inside them, and when those filters clog, shred, or lose their pleats, your cleaner starts leaving behind the fine silt it was bought to remove. I compared five of the most popular replacement filter options for robotic pool cleaners to help you figure out which one actually fits your machine and your maintenance habits. If you own a modern Dolphin robot like the S200, Triton PS, or Active series, the Ultra-Fine Filter Panels (9991467-R4) earn my top spot for their near-OEM fit and numbered installation system. For Hayward owners, the RCX70101PAK2 two-pack is the obvious counterpart, with a rugged ABS frame and a 2-3 year lifespan. And if you’re running a Nautilus CC Plus or M-series Dolphin, the SUNRRA 4-pack delivers the best cost-per-filter value. The main tradeoff across this entire category is OEM fit versus price: third-party filters cost roughly half as much as branded ones, but you have to verify compatibility carefully because Dolphin uses several incompatible filter formats across its model range. The second tradeoff is ultra-fine pleated filtration versus cleaning effort — finer media catches more silt but needs rinsing far more often.
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Key Takeaways
- Dolphin cleaners use at least two distinct filter formats (9991467-R4 and 9991432-R4), and they are not interchangeable — matching your part number matters more than brand choice.
- The top pick, the Ultra-Fine Filter Panels 9991467-R4, covers the broadest range of modern Dolphin models including the S-series, Active, Triton PS, and Warrior lines.
- Hayward TigerShark and SharkVac owners should default to the RCX70101PAK2 two-pack; it’s the only option in this lineup built for Hayward robots.
- The SUNRRA 4-pack offers the lowest cost per filter for Nautilus CC Plus and M200/M400/M500 owners, backed by a 1-year guarantee.
- All five filters are washable and reusable, but performance depends on rinsing every 4-6 weeks — buying a 4-pack lets you rotate clean filters instead of waiting for one to dry.
| replacement filters for automatic pool cleaner | Quantity | Compatible Models | Filter Type |
|---|---|---|---|
| Ultra-Fine Filter Panels | 4 panels (numbered 1-4) | Dolphin Active 20/30/30i/40/60, S200/S300/S300i/S400, Proteus DX4/DX5i, Triton PS/PS Plus, Warrior SE/SI, Explorer E30/E50/E70, M600, Prowler 920/930, and more | Ultra-fine pleated cartridge panels |
| Replacement Ultra-Fine Filter | 2 pack | TigerShark, TigerShark QC/Plus, TigerShark 2/2 Plus, SharkVac, SharkVac XL, AquaVac 500 | — |
| 4-Pack Ultra-Fine Filter Panel | 4 filter panels | Active 20/30/30i/40/60, Explorer E30/E50, Proteus DX4/DX5i, Prowler 920/930, S200/S300/S300i/S400, T35/T45/T55i, Triton PS/PS Plus, Warrior SE/SI | Ultra-fine pleated cartridge |
| Dolphin 9991432-R4 Replacement | 4 pack | Dolphin M400, M500, Nautilus CC Plus | 3-Layered Pool & Spa Filter |
| SUNRRA Ultra Fine Pleated Filt | 4 pack | Nautilus CC Plus, CC Supreme, M200/M400/M500, Supreme M4/M5, Sigma, Odyssey, Oasis Z5i/Z5, Triton Plus (old), Aquarius XL, Liberty, Wave 60/65/80/90, C3, C4 | — |
More Details on Our Top Picks
Ultra-Fine Filter Panels (Part# 9991467-R4) Replacement Cartridges for Dolphin Robotic Pool Cleaners
This 4-pack of ultra-fine pleated panels is a direct replacement for Dolphin Part# 9991467-R4, and it earns the top spot in my lineup for one simple reason: it covers the largest population of modern Dolphin robots, from the S200 and S300i through the Active 20/30, Proteus DX4, Triton PS, and Warrior series. Compared with the SUNRRA filters later in this list, which serve the Nautilus CC Plus and M-series crowd, this set targets the newer top-load basket format, so the two never really compete head-to-head — compatibility decides your winner.
What separates these panels from generic screen-style filters is the pleated ultra-fine media, which traps silt, pollen, and algae particles that coarse filters simply pass back into the water. The numbered panels (1 through 4) sound like a gimmick until you’re standing over an open cleaner trying to remember which slot each filter came from — they remove that guesswork entirely. Panels pop out and rinse clean with a garden hose.
The tradeoffs are real, though. Because this is a third-party replacement rather than an original Dolphin product, fit tolerance can vary slightly from unit to unit, and cleaning performance depends on using moderate hose pressure — blasting the pleats at full pressure can flatten or damage them. Compared with the identically-part-numbered 4-pack from SUNRRA-style listings, this option’s edge is consistency across the widest confirmed model list, which is why it sits at number one.
Pros:- Direct replacement for original Dolphin Part# 9991467-R4 across dozens of models
- Pleated ultra-fine media captures silt and pollen that screen filters miss
- Numbered panels eliminate installation guesswork
- Washable and reusable, making the 4-pack last a full season or more
Cons:- Third-party replacement, so fit tolerance may vary slightly from OEM
- Cleaning performance depends on careful hose pressure — high pressure can damage pleats
Best for: Owners of modern Dolphin robots (S-series, Active, Triton PS, Warrior, Proteus) who want OEM-equivalent filtration at a lower price.
Not ideal for: Owners of older Nautilus CC, Nautilus CC Pro, or M400/M500 models — those require the 9991432-R4 format instead.
- Replacement Part Number:9991467-R4
- Filter Type:Ultra-fine pleated cartridge panels
- Quantity:4 panels (numbered 1-4)
- Compatible Models:Dolphin Active 20/30/30i/40/60, S200/S300/S300i/S400, Proteus DX4/DX5i, Triton PS/PS Plus, Warrior SE/SI, Explorer E30/E50/E70, M600, Prowler 920/930, and more
- Washable/Reusable:Yes
- Cleaning Method:Rinse with garden hose
Our verdict“The safest all-around choice for the broadest range of modern Dolphin robots, balancing OEM-level fit, fine filtration, and a full 4-filter rotation.”
Replacement Ultra-Fine Filter Cartridges for Hayward Robotic Pool Cleaners (RCX70101PAK2, 2 Pack)
Every other filter in this roundup serves the Dolphin ecosystem, which makes this two-pack the default — and frankly only sensible — pick for anyone running a TigerShark, SharkVac, or AquaVac robot. If you own a Hayward cleaner, comparing pleat counts against Dolphin filters is pointless; what matters is whether the cartridge clicks securely into your robot’s tray, and this one replaces OEM part RCX70101 exactly.
The build quality is where this option justifies its place. The frame is durable ABS plastic rather than the thinner, more brittle housings on bargain cartridges, and the media is thickened PET fiber woven in a diamond-shaped grid — a construction that resists tearing when you’re hosing packed dirt out of the pleats. The three-piece disassemblable design also makes deep cleaning easier than one-piece cartridges allow, which extends useful life toward the claimed 2-3 years.
The honest drawback: you only get two filters instead of four for roughly similar money to the Dolphin 4-packs, so the per-filter cost is higher. And like every option here, it’s an aftermarket part, not an original Hayward cartridge — fine for most owners, but purists who want the OEM label will pay more elsewhere. The required rinsing every 4-6 weeks is standard for this category, but skipping it will clog the pleats and shorten that 2-3 year lifespan considerably.
Pros:- Exact replacement for Hayward RCX70101PAK2 across TigerShark, SharkVac, and AquaVac models
- ABS frame and diamond-grid PET fiber withstand frequent rinsing without fraying
- Three-piece disassemblable design simplifies deep cleaning
- Realistic 2-3 year usable lifespan per cartridge
Cons:- Only 2 filters per pack, so cost per filter is higher than the Dolphin 4-packs
- Aftermarket replacement, not an original Hayward part
Best for: Hayward TigerShark, SharkVac, or AquaVac owners who need a rugged, long-lasting cartridge and don’t need a 4-filter rotation.
Not ideal for: Dolphin owners (nothing here fits) and buyers who want the lowest cost per filter.
- Part Number:RCX70101PAK2 / RCX70101
- Quantity:2 pack
- Compatible Brands:Hayward, Maytronics
- Compatible Models:TigerShark, TigerShark QC/Plus, TigerShark 2/2 Plus, SharkVac, SharkVac XL, AquaVac 500
- Frame Material:ABS plastic
- Filter Material:Thickened PET fiber, diamond-shaped grid
- Expected Lifespan:2-3 years
- Cleaning Interval:Every 4-6 weeks
Our verdict“The clear pick for the Hayward camp — tougher construction than most rivals, but you pay more per filter for the smaller pack size.”
4-Pack Ultra-Fine Filter Panels Replacement for Dolphin Robotic Pool Cleaners (9991467-R4)
This is the value play of the lineup. It replaces the exact same part number — Dolphin 9991467-R4 — as my top pick, fits the same Active, Explorer, Prowler, Proteus, Triton, S-series, and Warrior models, and includes the same four numbered panels, but typically at a lower price point. If the number-one pick is out of stock or priced high, this is the substitute that gets the job done.
How does it differ from the Best Overall pick? In practice, the differences are subtle: same pleated ultra-fine media, same numbered-panel installation system, same garden-hose cleanup. What you give up is a bit of certainty — the compatibility list is slightly more condensed, and buyers of less common Dolphin variants should double-check their model against the listing before ordering. Compared with the Nautilus-format filters in this guide (the Dolphin 9991432-R4 and SUNRRA packs), this one clearly captures finer debris than stock screen filters, but it’s useless to M400/M500 or Nautilus CC Plus owners because the formats don’t interchange.
The standout benefit of any 4-pack like this is rotation: rinse two panels, let them dry completely overnight, and install the dry pair next cycle. Wet filters left in a cleaner develop mildew smells and degraded pleats. That habit alone extends the life of this set well beyond a single season, which is where the real savings come from. The catch is maintenance discipline — these panels demand regular cleaning, and neglect shows up fast in your water clarity.
Pros:- Same OEM part number (9991467-R4) and fitment as the top pick, usually cheaper
- Pleated ultra-fine media outperforms flat screen filters on fine debris
- Four numbered panels enable a clean/dry rotation system
- Reusable and rinses clean with a garden hose
Cons:- Compatibility list is narrower than the top pick, so verification is essential
- Requires consistent cleaning to maintain performance
Best for: Budget-conscious owners of 9991467-R4-compatible Dolphins who want a full rotation set at the lowest price.
Not ideal for: Owners of Nautilus CC Plus, M200/M400/M500, or older Nautilus models that use the 9991432-R4 format.
- Part Number Replaced:9991467-R4
- Quantity:4 filter panels
- Filter Type:Ultra-fine pleated cartridge
- Compatible Brands:Dolphin robotic pool cleaners
- Compatible Models:Active 20/30/30i/40/60, Explorer E30/E50, Proteus DX4/DX5i, Prowler 920/930, S200/S300/S300i/S400, T35/T45/T55i, Triton PS/PS Plus, Warrior SE/SI
- Reusable:Yes — rinse with garden hose
Our verdict“The smart money pick when it’s priced below the top choice — same part number, same fit, same filtration, slightly more homework required.”
Dolphin 9991432-R4 Replacement Pool Filter Cartridge, 4-Pack (Compatible with Dolphin M400/M500, Nautilus CC Plus)
Where the first three picks serve the newer 9991467-R4 format, this 4-pack targets the other half of the Dolphin universe: the M400, M500, and Nautilus CC Plus robots that use the 9991432-R4 cartridge. Its claim to the Best Durability slot rests on construction — each filter is a 3-layered cartridge using enhanced PET fiber woven into a diamond grid, which resists impact and tearing better than single-layer pleats when your cleaner churns through leaves, acorns, and coarse sand.
Compared with the SUNRRA filters that share the same part number, this option’s advantage is the 3-layer build; SUNRRA’s edge is price and a longer compatibility list (it also fits the CC Supreme, M200, Sigma, and more). If you own exactly an M400, M500, or CC Plus and your pool collects heavy debris, the layered construction here makes more sense. If you want maximum model coverage or a warranty, SUNRRA wins.
The compatibility footnote deserves bold treatment: this filter is not compatible with the Nautilus CC or Nautilus CC Pro — a distinction that trips up a huge number of buyers because the model names are nearly identical. Ordering the wrong one means a cartridge that looks almost right but won’t seat or seal properly, leaking debris straight back into the pool. Check the exact name on your unit’s label before checkout.
Pros:- 3-layered construction with diamond-grid PET fiber resists tearing from coarse debris
- Convenient 4-pack supply supports a rotation routine
- Direct replacement for the 9991432-R4 format
- Enhanced filtration over stock screen baskets
Cons:- Narrow compatibility: only M400, M500, and Nautilus CC Plus confirmed
- Not compatible with Nautilus CC or Nautilus CC Pro despite the similar names
Best for: M400, M500, and Nautilus CC Plus owners whose pools collect heavy, coarse debris that punishes single-layer filters.
Not ideal for: Nautilus CC and Nautilus CC Pro owners — wrong format — and anyone with the newer top-load Dolphin models.
- Part Number:9991432-R4
- Quantity:4 pack
- Material:Enhanced PET fiber
- Filter Type:3-Layered Pool & Spa Filter
- Compatible Models:Dolphin M400, M500, Nautilus CC Plus
- Washable/Reusable:Yes
Our verdict“The toughest cartridge in the lineup for debris-heavy pools, provided your Dolphin is one of the three models it actually fits.”
SUNRRA Ultra Fine Pleated Filters Compatible with Dolphin Nautilus CC Plus, CC Supreme, M200/M400/M500 (Part # 9991432-R4), 4-Pack
SUNRRA’s 4-pack is the value champion for the older Dolphin format, and it wins on two fronts: price per filter and compatibility breadth. While the Best Durability pick covers three models, SUNRRA lists well over a dozen, including the Nautilus CC Supreme, M200, Sigma, Odyssey, Oasis Z5i, Aquarius XL, Liberty, and Wave series. If you own one of the less common Dolphins, this is likely your easiest match.
The construction holds its own against pricier rivals: a heavy-duty ABS frame rated for 2-3 years of use, pleated ultra-fine media at a generous 10.5 by 6.375 inches, and the standard garden-hose cleanup routine. Against the Hayward two-pack, you’re getting double the filters for comparable money — but only if your cleaner is in the Dolphin 9991432-R4 family. The 1-year quality guarantee is also something none of the other Dolphin-format packs here offer, which softens the risk that always comes with third-party parts.
The exclusions list matters more than the inclusions, though: SUNRRA explicitly does not fit the original Nautilus, Nautilus CC, Triton, Triton PS, or Triton PS Plus. Triton PS owners belong up in the 9991467-R4 camp with my top pick. Like everything else in this category, skipping the 4-6 week rinse cycle will clog the pleats and quietly sabotage your cleaner’s suction, so the low sticker price assumes you’ll do the maintenance.
Pros:- Lowest cost per filter among the 9991432-R4 options
- Widest model compatibility in the older Dolphin format, covering 15+ models
- Heavy-duty ABS frame rated for 2-3 years of use
- 1-year quality guarantee, rare among third-party filters
Cons:- Long exclusion list — original Nautilus, Nautilus CC, and Triton models will not fit
- Requires rinsing every 4-6 weeks to maintain performance
Best for: Nautilus CC Plus/CC Supreme and M200/M400/M500 owners — especially those with less common models — who want the cheapest per-filter cost with warranty backing.
Not ideal for: Triton, Triton PS/PS Plus, and original Nautilus CC owners — those cleaners use different filters entirely.
- Brand:SUNRRA
- Model Number:9991432-R4
- Quantity:4 pack
- Filter Dimensions:10.5 in L x 6.375 in W
- Frame Material:ABS plastic
- Compatible Models:Nautilus CC Plus, CC Supreme, M200/M400/M500, Supreme M4/M5, Sigma, Odyssey, Oasis Z5i/Z5, Triton Plus (old), Aquarius XL, Liberty, Wave 60/65/80/90, C3, C4
- Warranty:1 year quality guarantee
- Expected Lifespan:2-3 years
Our verdict“The best bang-for-buck option for the Nautilus and M-series crowd, trading a little exclusivity risk for a warranty and the lowest per-filter price.”
How We Picked
Since replacement filters are consumables rather than gadgets, I judged these five products on a different set of criteria than I would use for the cleaners themselves. First, I looked at compatibility accuracy. Dolphin alone splits its robots across at least two cartridge formats, and listing the wrong part number means a filter that physically cannot seat in the basket. I prioritized products that publish a specific, verifiable model list rather than vague claims like “fits most Dolphins.” Second, I weighed filtration media quality. Pleated ultra-fine cartridges catch particles down to the silt and pollen range that flat screen filters pass straight through, so pleat density and frame material (ABS versus thinner plastics) became a real differentiator. Third, I considered cost per filter and pack size. A 4-pack lets you rotate a dry, clean set in while the rinsed set dries, which matters more than most buyers realize. Fourth, I factored in longevity claims and warranties — a filter rated for 2-3 years with a guarantee beats a cheaper one that frays after one season. Finally, I compared each product against the others in this lineup rather than in isolation, because the honest answer to “which filter is best” is almost always “whichever one matches your specific cleaner.”
| replacement filters for automatic pool cleaner | Compatible Models |
|---|---|
| Ultra-Fine Filter Panels | Dolphin Active 20/30/30i/40/60, S200/S300/S300i/S400, Proteus DX4/DX5i, Triton PS/PS Plus, Warrior SE/SI, Explorer E30/E50/E70, M600, Prowler 920/930, and more |
| Replacement Ultra-Fine Filter | TigerShark, TigerShark QC/Plus, TigerShark 2/2 Plus, SharkVac, SharkVac XL, AquaVac 500 |
| 4-Pack Ultra-Fine Filter Panel | Active 20/30/30i/40/60, Explorer E30/E50, Proteus DX4/DX5i, Prowler 920/930, S200/S300/S300i/S400, T35/T45/T55i, Triton PS/PS Plus, Warrior SE/SI |
| Dolphin 9991432-R4 Replacement | Dolphin M400, M500, Nautilus CC Plus |
| SUNRRA Ultra Fine Pleated Filt | Nautilus CC Plus, CC Supreme, M200/M400/M500, Supreme M4/M5, Sigma, Odyssey, Oasis Z5i/Z5, Triton Plus (old), Aquarius XL, Liberty, Wave 60/65/80/90, C3, C4 |
Factors to Consider When Choosing Replacement Filters For Automatic Pool Cleaners
Choosing a replacement filter comes down to three questions: does it fit your cleaner, does it catch the debris your pool actually collects, and how much maintenance are you willing to do? Here’s how I’d work through the decision.Match the Part Number First
Before comparing prices or pleat counts, find the exact part number your cleaner uses. Dolphin splits its robots across at least two formats — 9991467-R4 for newer Active, S-series, and Triton PS models, and 9991432-R4 for Nautilus CC Plus and M-series machines — and they are not interchangeable. The part number is usually printed on the original filter’s frame or in your cleaner’s manual. Hayward robots use the RCX70101 format. Ordering by part number rather than by cleaner name is the single most reliable way to avoid a return.
Pleated Ultra-Fine vs. Screen Filters
Most robotic cleaners ship with both a coarse screen basket for leaves and large debris and a fine cartridge for silt. When replacing the fine side, pleated ultra-fine media captures dramatically smaller particles than flat screen mesh — think pollen, algae spores, and fine sand, the material that makes water look cloudy. The tradeoff is that pleats clog faster, so a finer filter means more frequent rinsing. If your pool sits under trees, run the screen and fine filters together so leaves don’t choke the pleats.
Frame Material and Longevity
The media gets the glory, but the ABS plastic frame determines whether a cartridge survives a season. Thin frames crack when you’re hosing packed dirt out of the pleats, and a cracked frame lets debris bypass the filter entirely. Look for ABS construction and reinforced PET fiber weaves (the diamond grid pattern appears across several quality options here), and expect a realistic lifespan of 2-3 years per cartridge with proper care.
Pack Size and Rotation Strategy
A 4-pack isn’t just about running out less often — it enables rotation. Rinse the dirty set, let it dry fully overnight (wet filters left in a cleaner mildew quickly), and install the dry set. This habit can double the useful life of each cartridge. Two-packs like the Hayward option cost more per filter but make sense when the individual cartridges are built to last longer. Do the per-filter math before assuming the bigger pack is the better deal.
OEM vs. Third-Party
Every filter in this roundup is a third-party replacement, and honestly, that’s where the value is — OEM Dolphin and Hayward cartridges often cost twice as much for near-identical filtration. The risk with aftermarket parts is fit tolerance and quality control, which is why I favor options with specific published compatibility lists and, where available, a warranty like SUNRRA’s 1-year guarantee. If your robot is still under manufacturer warranty, check whether third-party consumables affect coverage before ordering.
Frequently Asked Questions
How often should I replace the filters in my robotic pool cleaner?
With proper care, a quality pleated cartridge lasts 2-3 years, but that assumes you rinse it every 4-6 weeks during the swimming season. Replacement becomes necessary when you notice specific warning signs: pleats that stay stained or slimy after rinsing, visible tears or fraying in the media, cracks in the plastic frame, or a cleaner that loses suction even with freshly washed filters installed. If your water stays cloudy despite the cleaner running its full cycle, clogged or exhausted filter media is the most likely culprit. Heavy-use pools with lots of trees, pets, or bathers will wear filters out at the faster end of that range, so inspect the media closely at the start of each season.
Are third-party replacement filters as good as OEM Dolphin or Hayward filters?
For most owners, yes — the filtration media and frame construction on quality aftermarket cartridges are functionally very close to OEM parts, often at half the price. The differences show up in quality control consistency rather than day-one performance: a third-party filter might have slightly tighter or looser fit tolerance, and batch-to-batch variation is more common than with branded parts. My advice is to buy from listings that publish a specific, verifiable compatibility list rather than vague claims, and to favor products with a warranty when the price difference is small. If your robotic cleaner is still under its manufacturer warranty, confirm that third-party consumables won’t void it, though most manufacturers exclude wear items from coverage anyway.
Why won’t a 9991467-R4 filter fit my Nautilus CC Plus (or vice versa)?
Dolphin uses at least two physically different cartridge formats across its model range, and the part numbers reflect that divide. The 9991467-R4 format is a set of four numbered panel cartridges used in newer top-load models like the S-series, Active, Triton PS, and Warrior lines. The 9991432-R4 format is a different cartridge shape used in the Nautilus CC Plus, CC Supreme, and M200/M400/M500 machines. The two have different dimensions and mounting systems, so a filter from one family simply won’t seat or seal in the other. Adding to the confusion, similarly named models can use different formats — the Nautilus CC Plus takes the 9991432-R4 while the separate Nautilus CC and CC Pro take neither. Always verify by part number, not model name alone.
Can I clean and reuse these filters, or are they single-use?
All five filters in this roundup are designed to be washed and reused many times. The cleaning method is simple: remove the cartridge, hose it down with a garden hose working from the inside out, and let it dry completely before reinstalling. The drying step matters more than most people realize — storing damp filters inside the cleaner encourages mildew and degrades the pleats. Use moderate water pressure rather than a pressure washer, which can flatten or tear the pleated media. For deep cleaning when oils and fine silt have worked into the fabric, a brief soak in a mild detergent solution followed by a thorough rinse restores flow. Expect dozens of cleaning cycles per cartridge before the media wears out.
Do I need both fine filters and coarse screen filters in my cleaner?
Yes, and running both is how these robots are designed to work. The coarse screen basket handles leaves, insects, and large debris, protecting the finer media behind it from shredding under a heavy load. The ultra-fine pleated cartridge then captures the silt, pollen, and algae-sized particles that make water cloudy. If you run only the fine filter in a debris-heavy pool, the pleats clog within a single cycle and your cleaner’s suction drops. If you run only the screen, your water will look clean-ish but never polished. Most Dolphin models let you swap configurations, so a sensible routine is fine filters for everyday maintenance cycles and the screen combination after storms or heavy leaf fall.
Conclusion
After comparing all five, my recommendations break down cleanly by what you own and how you use it. Owners of modern Dolphin robots — the S-series, Active, Triton PS, Proteus, or Warrior lines — should go with the Ultra-Fine Filter Panels 9991467-R4 (Best Overall) for the widest confirmed compatibility, or drop to the budget 4-pack if it’s listed cheaper that week, since the part number is identical. Hayward TigerShark and SharkVac owners have one real path: the RCX70101PAK2 two-pack, which trades a smaller pack for the most durable frame in the lineup. Nautilus CC Plus, CC Supreme, and M-series owners should choose between the 3-layer Dolphin cartridge if their pool collects heavy, coarse debris, or the SUNRRA 4-pack for the lowest per-filter cost, the broadest model coverage, and a 1-year guarantee — my default recommendation for that format. Whichever you choose, verify the part number against your original filter before ordering, commit to the 4-6 week rinse cycle, and rotate a dry set in while the other dries. That routine will keep any of these filters performing for seasons, not months.
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