Black Ops Replacement Pre-Filter 14 in x 48 in White Simple Deluxe Carefully processed and sifted to

Carefully processed and sifted to make it easy to work with

This is the perfect blend for plants during periods of accelerated growth

Better quality and drainage than other value-priced rockwool

Phosphorous

It has five times the concentration and therefore its application rates are reduced

Black Ops Replacement Pre-Filter 14 in x 48 in White Simple Deluxe Carefully processed and sifted toUse these for a pre filter on you Black OpsNutrients Carbon Filters. Match the pre filter to your Black OpsNutrients Carbon Filter size. Helps to extend the life of your Black OpsNutrients Carbon Filter by keeping dust and other particles out. The white pre filters give a bright, clean appearance.