The filter must be screwed onto the bottom opening that draws water from the whirlpool to the pump in the motor base.
For COMBO whirlpools, this is the opening marked ‘B’ (COMBO whirlpools have both bubbles and water massage jets).
For BUBBLE SPA and SIMPLE SPA whirlpools, the filter must be screwed onto the opening marked with ‘C’ (BUBBLE SPA and SIMPLE SPA whirlpools have bubbles only, no massage jets).
If the filter is mounted elsewhere, the water will not pass through the filter cartridge, which is supposed to catch mechanical impurities (such as hair), and will clog the pump outlet instead. Impurities that enter the filter system like this may damage it (pump jamming, scraping the pump duct, breaking the axle, etc.). These types of damage are not covered by the warranty.