Find your parts diagram
Sticker on the pump body (the part with the basket), not on the motor. Motor labels from Century, A.O. Smith or Regal won't match parts.
Label on the side of the tank near the base. Size is in sq ft, e.g. 420 sq ft = C4030 or CCP420.
Rating plate inside the front access panel. Note the BTU and gas type (NG or LP).
Molded into the body or printed on top. Robotic cleaners: on the power supply.
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C-4621 | Unicel Leaf Canister Cartridge 25 Sq. Ft.
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CA P65 Warning: Cancer and reproductive harm. www.p65warnings.ca.gov
The Unicel C-4621 is a 25 square foot leaf canister replacement cartridge engineered to tackle some of the most stubborn pool contaminants — including plaster dust residue, sand, and fine debris left behind by swimmers and leaf blowers. Designed for compatibility with most major leaf canister brands including Hayward, Rainbow, and Swimables, this cartridge is a reliable, drop-in solution that requires no special modifications or adapters. Built from a heavy-duty 6-ounce filter media, the C-4621 offers superior particle capture compared to standard-weight cartridges, making it especially well-suited for newly plastered pools or high-debris environments. One of the standout advantages of the C-4621 is its environmentally friendly, cleanable, and reusable design — simply rinse and reinstall to extend the service life of the cartridge and reduce waste. Proudly made in the USA, this Unicel cartridge reflects the brand's commitment to quality manufacturing and dependable pool filtration performance.
- Heavy-Duty 6-Ounce Filter Media: Constructed with a 6-ounce media weight — heavier than standard cartridge options — the C-4621 delivers enhanced filtration performance, effectively capturing fine particles like plaster dust, sand, and other debris that lighter media may miss.
- 25 Sq. Ft. Filtration Area: With a 25 square foot filter area, this leaf canister cartridge provides ample surface coverage to handle demanding filtration tasks in both residential pools and spas, maintaining water clarity even in high-debris conditions.
- Broad Canister Compatibility: Engineered to fit most major leaf canister brands including Hayward, Rainbow, and Swimables, the C-4621 is a versatile replacement option that installs easily without the need for adapters or modifications.
- Cleanable & Reusable Design: The C-4621 features an environmentally friendly, cleanable design that allows pool owners to rinse and reuse the cartridge rather than replacing it after each use, reducing ongoing maintenance costs and waste.
- Made in the USA: Manufactured domestically to Unicel's rigorous quality standards, the C-4621 reflects the brand's decades-long commitment to producing dependable, high-performance filter cartridges built to meet or exceed OEM specifications.