Jandy CS100 100 sq ft Cartridge Filter
The one to buy from a dealer, not online — A 5% complaint rate and good hydraulics — attached to a warranty that excludes the way you would buy it here
Contender — The Best Single-Element Cartridge Pool Filters (2026): StarClear vs Clean & Clear vs Jandy CS
Specs
| Filter area | 100 sq ft |
| Elements | 1 (single-element) |
| Pool type | In-ground |
| Suits | About 10,000 gallons at the standard sizing rule |
| Warranty (online) | None — Jandy excludes internet purchases |
Pros
- 5.0% critical rate on 40 owners — one of the two lowest in this roundup
- Only two critical reviews in the entire base
- Jandy's hydraulics are well regarded and the CS line is a straightforward single-cartridge design
Cons
- Jandy's warranty does not apply to products purchased through the internet, full stop — there is no online SKU that fixes it
- One owner reports green algae blowing through the collar at the top and bottom of the cartridge, which is water bypassing the element rather than passing through it
- One leak at six months, described as cheap plastic
- About $850 for 100 sq ft is above the Pentair equivalent, before you account for having no warranty
Bypass at the cartridge collar, on a very thin complaint tail
2 of 40 ratings are critical (5.0%), read signed-in 2026-08-26 — among the lowest rates here. One describes green algae blowing through the collar at the top and bottom of the cartridge, which is the signature of water going around the element rather than through it. One reports a leak at six months. · critical reviews read August 2026
FAQ
Who is the Jandy CS100 100 sq ft Cartridge Filter for?
You are buying through a pool professional or a dealer, where the warranty actually exists. Bought online it is a good filter with no coverage at all, and that is a poor trade at this price.
What do owners say about the Jandy CS100 100 sq ft Cartridge Filter?
4.4★ across 40 owner ratings (Amazon, read August 2026 · early data). What owners complain about: Bypass at the cartridge collar, on a very thin complaint tail
What is the warranty on the Jandy CS100 100 sq ft Cartridge Filter?
None — Jandy excludes internet purchases
Does the Jandy CS100 100 sq ft Cartridge Filter warranty still apply if I buy it on Amazon?
Jandy answers that in its own warranty document, which we read on 2026-09-08: This Jandy Limited Warranty does not apply to Jandy branded products purchased through the Internet or other e-commerce platforms, with the exception of Jandy branded valves less than three (3) inches in diameter, parts, and pool product accessories. … This warranty applies only to products installed and serviced by a contractor who is licensed and qualified in pool equipment by the jurisdiction in which the product will be installed. We quote the maker rather than deciding your case — read the document before you buy if the warranty is why you are buying.
Record
- — Price read 2026-10-02 from the live Amazon offer (Creators API): $849.95, no deal flag; was $749. Published at read time per the 2026-09-15 rule, ahead of Prime Big Deal Days.
- — Review base read: 4.4★ across 40; a size menu; 8 visible reviews, no free-product (Amazon Vine) reviews, all US. So the rating describes this one product, bought by US owners. Our listed rating was not changed in this pass.
Warranty — and what changes if you buy it on Amazon
None — Jandy excludes internet purchases · you are buying this on Amazon
This Jandy Limited Warranty does not apply to Jandy branded products purchased through the Internet or other e-commerce platforms, with the exception of Jandy branded valves less than three (3) inches in diameter, parts, and pool product accessories. … This warranty applies only to products installed and serviced by a contractor who is licensed and qualified in pool equipment by the jurisdiction in which the product will be installed.
Jandy’s own warranty document · read
Read it yourself: Jandy 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 any filter in this roundup (full database, 9,966 records, read 2026-08-26). A cartridge filter is a PRESSURE VESSEL: shut off the pump, open the manual air relief valve and wait for water rather than air before touching the closure — see /pool-school/pool-filter-pressure-vessel-safety/.
Size your pool first → ·All pool gear →
Data last verified: October 2026. Ratings are real, dated reads — never scraped or invented. Full methodology and monetization disclosure: how we test.