Nordic Hot Tub 25Sqft Filter 31CARTRIDGE

Factory original Nordic Hot Tub 25 sqft replacement filter 31CARTRIDGE for select hot tub models including select model year Omni hot tubs.

31CARTRIDGE is a 25sqft filter that fits select Nordic filter assemblies 30100706 and 30100708 and filter gasket 01-0037.

This filter was used in select model year Nordic hot tubs up to Sept. 2021.

Newer spas/Elite Series may use the other filter 31CARTRIDGE-E  for spas built after Sept. 2021 as the filter assembly then changed to canister 30172700.

We also offer other Nordic hot tub filters such as:

31CARTRIDGE-E  for Elite Spas / 09-21 and newer models,  (fits filter assembly 100709 with weir assembly 30172700)

31CARTRIDGE14.5  14.5 sqft filter  for hot tubs using the SpaceSaver and SpaceSaver II filter assemblies (the actual Space Saver filter assembly 100718 is no longer available)

31CARTRIDGE-BELLA  for Bella models from 2018 to current model year spas. (fits filter assembly 100719)

31CARTRIDGE-T35  35 Sqft filter (fits filter assemblies 100736 and 100738)