Previous Product Hydrologic – Evolution RO1000 KDF Catalytic Carbon Pre-Filter $75.00 SKU: O0019 Category: Filters Related products Quick View Quick View FiltersCan Filter 50 – 420 CFM $235.00 Quick View Quick View FiltersAir Box 4 – Stealth Edition – 3500CFM – 12″ $600.00 Quick View Quick View FiltersCan Filter 100 – 840 CFM $320.00