The  PP  Scale Inhibitor cartridge is designed to fit inside the Liff NP1, NDL2 or other manufacturers 10" water filter cartridge housings. The  PP inhibits the build up of scale in a domestic water system and can be installed on the incoming main if required. The PP doses the water with food grade polyphosphate.

CHANGING THE FILTER CARTRIDGE. It is recommended that PP water filter cartridges are changed at least every 12 months, but on occasions it may be necessary to change the water filter cartridge more frequently.