Hydro-Logic 741624 KDF/Catalytic 20" x 2.5" Tall Boy Carbon Filter Compatible

Because KDF does most of the heavy lifting in removing contaminants, the carbon lasts much longer. The carbon is used then to mainly "polish" the water to give it a sparkling taste. KDF 85 Removes or reduces iron, chloramines, and hydrogen sulfide from municipal or other water supplies.

eBay