KoolerMax Series replacement filter kit for 

Model:  AR-122,  HK-120,  HK-220

High capacity, replace every 12 month,  Part no. KPAK-3

1st stage:  high capacity, multi-layer 5 micron sediment filter, to remove sediment, rust, sand, (replace every 6-12 months)

2nd stage:  high capacity carbon filter, carbon block, coconut shell activated carbon removes chlorine, taste & odor (replace every 12 months)  * We have modified the filter from granular to carbon block for higher performance.

3rd stage:  high capacity carbon filter, carbon block, coconut shell activated carbon further removing chlorine to ensure 100% removal of chlorine (replace every 12 months) * We have modified the filter from granular to carbon block for higher performance.