Quick verdict
The budget-friendly cartridge filter for smaller pools and spas. Cartridge benefits without the big-filter price — just expect shorter cycles.
Ideal for
- Smaller in-ground pools and spas
- Owners who want cartridge benefits cheaply
- Tight equipment pads
Not ideal for
- Mid-to-large pools (too small — short cycles)
- Owners wanting months between cleanings
The full picture
Not every pool needs a 325-square-foot behemoth. The Star-Clear Plus C900 is Hayward's compact 90-square-foot single-cartridge filter, and it's the right-sized cartridge option for smaller in-ground pools, spas, and above-ground setups that can plumb it in. You get the cartridge advantages — fine filtration and no backwashing — in a small, affordable, easy-to-service package with a swing-away tank clamp for quick access. Cycles are shorter than the big multi-cartridge units simply because there's less media, but it's cheap, simple, and does exactly what a small pool needs.
Hayward Star-Clear Plus C900 Cartridge Filter (90 sq ft) at a glance
- Filter type
- Cartridge
- Filter area
- 90 sq ft
- Flow rate (GPM)
- 75
- Filtration (microns)
- 10–15
- Backwashing required
- No
- Filter media
- Single pleated cartridge
- Tank material
- Reinforced polymer
- Valve
- Manual air relief (no multiport)
- Pool type
- In-ground / spa
- Notable feature
- Compact single-cartridge; swing-away clamp for easy access
Source: Compiled from manufacturer specifications, retailer listings, and aggregated owner feedback. Specs and prices change — confirm with the retailer before buying.
This is a research-based review — our analysis draws on manufacturer specifications, manuals, warranty terms, and verified owner feedback rather than our own hands-on testing, and we note where a detail couldn't be confirmed. How we review
The in-depth review
Not every pool needs a 325-square-foot behemoth, and the Star-Clear Plus C900 is Hayward's answer for the ones that don't: a compact 90-square-foot single-cartridge filter.
The right-sized cartridge
You get the cartridge advantages — fine filtration around 10–15 microns and no backwashing — in a small, affordable package that fits tight equipment pads and suits smaller in-ground pools and spas. A swing-away tank clamp makes opening it for cleaning quick, and with just one element there's nothing complicated about maintenance. For a small pool, it delivers cartridge-grade water without the cost or bulk of a big multi-cartridge filter.
The honest caveats
Less media means shorter cycles — you'll rinse the cartridge more often than you would a large filter, and it's genuinely undersized for a mid-to-large pool, where you'd be cleaning it constantly. The cartridge needs periodic replacement, and there's no multiport versatility.
Performance breakdown
Research-based editorial judgments from specs, warranty terms, and verified owner feedback — not lab measurements. How we score
Pros and cons
What works
- Affordable cartridge filtration
- No backwashing
- Compact — fits tight pads and spas
- Swing-away clamp for quick cleaning
What doesn't
- Small capacity — shorter cycles
- Undersized for mid/large pools
- Cartridge needs periodic replacement
- No multiport versatility
Best alternatives to Hayward Star-Clear Plus C900 Cartridge Filter (90 sq ft)
Pentair
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The larger Sand Dollar — a 22-inch corrosion-proof sand filter with more capacity, suitable for bigger above-ground pools or small in-ground setups.
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SD40
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Pentair Sand Dollar SD40 Above-Ground Sand Filter
Best above-ground sand
A compact, one-piece blow-molded sand filter built for above-ground pools — corrosion-proof, simple, and easy to set up.
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Pentair Tagelus TA60D Sand Filter
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Pentair’s durable fiberglass-reinforced sand filter — a uniform sand bed and clamp-style multiport valve for reliable, low-cost filtration.
Hayward
Hayward Pro Series S244T Sand Filter (24 in)
Best value sand filter
The classic, low-fuss sand filter — cheap to run, forgiving, and dead simple, with a multiport valve that backwashes at the turn of a handle.
Frequently asked questions
What size pool is the C900 for?
Smaller in-ground pools and spas. Its 90 sq ft means shorter cycles than big multi-cartridge filters, so on a mid-to-large pool you’d be cleaning it too often — size up to a SwimClear instead.
Does it backwash?
No — like all cartridge filters, you clean it by removing and hosing off the single element, saving the water that sand and D.E. filters waste when backwashing.
How often will I clean it?
More often than a large filter, because it holds less dirt — expect to rinse the cartridge every few weeks in season depending on load. The swing-away clamp makes access quick.
Can I use it on an above-ground pool?
It can work on an above-ground pool that can plumb a tank filter, but many above-ground owners use a cartridge filter pump combo (like the Intex) instead for simplicity.
Star-Clear vs SwimClear?
Same cartridge idea, different scale: Star-Clear Plus is a compact single-cartridge filter for small pools/spas; SwimClear is a large multi-cartridge filter for mid-to-large pools with much longer cycles.
How long do the cartridges last?
A few years with regular rinsing and good water balance. Cleaning before pressure climbs too high is the key to getting full life from any cartridge.