Unicel 4CH-21 | 19 sq ft Saratoga & Vita Spa Filter Brand_Ooni No tools or adhesives are

No tools or adhesives are needed

With no moving parts

The removable silicone brush head is dishwasher safe for easy cleanup

Glance at the top of your old cartridge

Unicel 4CH-21 | 19 sq ft Saratoga & Vita Spa Filter Brand_Ooni No tools or adhesives areThe Unicel 4CH 21 is a compact 19 square foot top load replacement cartridge for Saratoga, Vita, Dream Maker, and several other spa brands, replacing OEM part numbers 20245 238 and PVT 25N. At just 8" tall and 4 5 8" across, it is one of the smaller cartridges in the top load family and it packs 158 pleats into that short body, a genuinely dense fold count for its size. The bottom carries a 1 1 2" male pipe thread that screws directly onto the suction