Hot Tub Serum Flipper | Oil-Absorbing Spa Sponge Type_Dough Cutter This cartridge has 3-1/8" openings

This cartridge has 3-1/8" openings with a molded gasket and no handle

Those 260 pleats create far more filtering surface than a coarse

Pro Tip: This cartridge seals at both ends — check yours before ordering

gentler conditions on skin and eyes

but by no means flimsy

Hot Tub Serum Flipper | Oil-Absorbing Spa Sponge Type_Dough Cutter This cartridge has 3-1/8" openingsFlipper is part of Hot Tub Serum's line of oil absorbing sponges a simple, chemical free way to keep your spa water clean. It floats on the surface and quietly soaks up the body oils, lotions, makeup, and other contaminants bathers leave behind, capturing them before they clog your filter or form scum lines on the shell. Those oils are the root of some of the most common spa annoyances. Left in the water, they collect at the surface and along the