Unicel 7CH-552 Replacement Filter Cartridge | 52 sq. ft. | Dimension One Spas PS3868 Do NOT test if your

Do NOT test if your pool water is below 65F

It forms flexible

Prefer to buy everything at once

A comfortable floor pad to cushion the feet of all pool goers

The S7D75 requires 2 grids

Unicel 7CH-552 Replacement Filter Cartridge | 52 sq. ft. | Dimension One Spas PS3868 Do NOT test if yourThe Unicel 7CH 552 is a 7000 Series 52 sq. ft. replacement filter cartridge engineered specifically for Dimension One Spas filtration systems. Built on 3 oz. Reemay 2033 polyester media with 216 precision pleats, it delivers maximized surface area in a compact 10 1 2" body keeping your spa water clean and clear between services. The 2" male thread bottom fitting threads directly into your filter standpipe for a secure, leak free connection.