Click or scroll to zoom Tap or pinch to zoom Hydro-Logic Pre-Evolution KDF/Catalytic Carbon Filter by Hydro-Logic Sold out $79.99 SKU 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Sold out KDF/Catalytic Carbon Pre-Filter reduces iron, sulfur, chlorine, chloramines and heavy metals. The pre-filters double the filter life. Great for city or well water! Bacteriostatic qualities do not allow microbes to breed in filter.