Overview Keep your spa water silky-smooth and crystal clear with the Poolzilla Rainbow 35 replacement filter cartridge. With 35 square feet of densely pleated filtration media, this cartridge traps oils, lotions, hair, and fine debris that cloud hot tub water — giving you more soak time and less scrubbing time. Measuring 9.25 inches in length and 5.0 inches in outer diameter with a 2-1/8 inch center hole, it's perfectly sized to drop right into standard Rainbow-style spa filter canisters without any modifications or adapters. The accordion-style pleats dramatically increase the dirt-trapping surface, which means your filter holds more debris between cleanings and your pump doesn't have to work overtime to push water through. Rigid molded end caps create a leak-proof seal so every drop of water passes through the filtration media — not around it. Because spa filters handle smaller water volumes with heavier bather loads than pool filters, plan to rinse your Rainbow 35 every two to four weeks and replace it every three to four months with regular use (or every six months for seasonal spas). You'll know it's time for a fresh cartridge when the water stays cloudy even after you shock it, when your jets feel weaker than usual, or when pump pressure climbs noticeably above its normal reading. A fresh filter doesn't just look better — it reduces chemical usage, eases strain on your pump motor, and keeps the water your family soaks in genuinely clean. Order your Poolzilla Rainbow 35 today, and consider grabbing a spare so you always have a fresh cartridge ready to rotate in. Clear water, happy soaks, zero hassle. What's Included Your order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.
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