Reduces up to 99% of chlorine, sulfur, iron, heavy metals, rust and silt KDF 85 Is The Most Advanced Media along with Catalytic Carbon! Great for use with Hydro Logic Systems and Standard 20" Housing - Compatible! Twice the life of the Green Coconut Filter Carbon Filter for Tall Boy and Tall Standard Blue 20" Housing. Rated at 2 GPM. Replace after 15,000 gallons Hydrologic TallBOY Compatible and Comparable 2.5" x 20" White filter. KDF85 is the most advanced media that one can use when it comes to filtering water along with pre-treating water before Reverse Osmosis filters. KDF85 not only has incredible chlorine and chloramines removal capabilities but it can also be successfully used for those on well or spring water sources to remove many other contaminants that can cause major problems in your garden. Nutrient lockout can be caused by several factors in water quality. Water high in iron and sulfur can be very common problems that lead to decreased yield and quality. These contaminants can also quickly foul Reverse Osmosis membranes so pre-treating the water and removing them is crucial to a properly operating filter system. Compatible KDF85 replacement filters are available for all Hydro-Logic's Reverse Osmosis and de-chlorinating filters.

Hydrologic TallBOY Compatible and Comparable 2.5" x 20" filter.

Compatible and Comparable Replacement Filter for Hydrologic TallBOY and Tall Blue Systems - 2.5" x 20" White filter.