Rx Clear 425 sq ft Quad Cartridge Filter
The cheapest real quad — A genuine four-element 425 for around $736 — with a critical tail four times the category's best
How to read a Showdown Score™
The only score that counts how often a product breaks, not just how owners feel about it.
- Three parts add up to the score: what owners rate it, how often it fails them, and whether a credentialed tester backed it.
- Bands: Exceptional 8.5 and up, Excellent 7.5, Very good 6.5, Good 5.5, Fair 4, Poor below 4. Every score is dated.
- Price, the warranty and what a link pays us stay out of it.
Fair, early data
Fair is 4.0 to 5.4.
Amazon says 4.1 stars. We score it 5.3, Fair: 17.1% of its 35 ratings are one or two stars.
See why it scored 5.3
Contender — The Best In-Ground Cartridge Pool Filters (2026): SwimClear vs Clean & Clear Plus vs Crystal Water
Specs
| Filter area | 425 sq ft |
| Elements | 4 (multi-element) |
| Pool type | In-ground |
| Warranty | 1 yr (brand owner PoolSupplies.com's listing) |
Pros
- Roughly $580 under the Waterway and $1,100 under the Hayward at identical filter area
- Genuinely four elements and genuinely Rx Clear's own listing, not a white-label using the name
- Reemay filter media and an HD-4 all-resin tank, both specified on the listing
- 2-inch ports and 150 GPM, so it does not bottleneck a variable-speed pump
Cons
- One review in six is critical, and the theme is performance rather than the cleaning-frequency grumble that dominates this category
- The most common complaint is that it does not filter: pressure differential never rises even with clogged cartridges
- Two of five critical reviewers received the unit with missing or wrong-sized union o-rings
- Owners report the manufacturer does not respond on defective units
- 35 ratings is a thin base for a pressure vessel you will own for a decade
Reports that it does not actually filter, plus missing o-rings on arrival and cartridges that broke early
6 of 35 ratings are critical (17.1%); two report the filter not filtering at all, two arrived with union o-rings missing or the wrong size, and the newest found every cartridge broken at about two months · critical reviews read October 2026
“Went from a sand filter to this cartridge filter, been using it for 4 months now and it is working fine. Price was good, quick shipping.”— victor martino, Amazon · Verified owner
FAQ
Who is the Rx Clear 425 sq ft Quad Cartridge Filter for?
You are replacing a filter on a budget that will not stretch to a major, you accept a thinner and rougher owner record, and you would rather have four cartridges at $736 than one cartridge at the same money.
What do owners say about the Rx Clear 425 sq ft Quad Cartridge Filter?
4.1★ across 35 owner ratings (Amazon, read October 2026 · early data). What owners complain about: Reports that it does not actually filter, plus missing o-rings on arrival and cartridges that broke early
What is the warranty on the Rx Clear 425 sq ft Quad Cartridge Filter?
1 yr (brand owner PoolSupplies.com's listing)
Record
- — Same-day read: 4.1 stars across 35 (was 4.2★ across 31), $699.99, In Stock. The listing now carries a 525 sq ft sibling on the same size selector with its own 4.0★ across 25, so the base is unpooled; ten of ten visible cards are US, no free-product (Amazon Vine) reviews. Critical tail 6 of 35 (17.1%); the newest, August 2026, found every cartridge broken at about two months.
Warranty — and what changes if you buy it on Amazon
1 yr (brand owner PoolSupplies.com's listing) · you are buying this on Amazon
Read it yourself: Rx Clear warranty document · we read it . Terms change without announcement, so treat this as a dated snapshot. How warranty works by buy path →
✓ Safety: no active recall — No CPSC recall for Rx Clear (database read 2026-08-26, 9,966 records, word-boundary matched across the whole record). Pressure vessel: stop the pump and bleed the air relief before opening the band clamp.
Size your pool first → ·All pool gear →
Data last verified: 2026-11-05. Ratings are real, dated reads — never scraped or invented. Full methodology and monetization disclosure: how we test.