Black Ops Replacement Pre-Filter 14 in x 39 in Black Active Aqua It helps keep the plants

It helps keep the plants upright

Some ingredients allow for instantly available nutrition

Liquid Bloom supplies a high ratio of nitrate to ammoniacal nitrogen needed to avoid stem elongation in flowering plants and vegetables

Emerald Harvest Root Wizard 6 Gal/22

Black Ops Replacement Pre-Filter 14 in x 39 in Black Active Aqua It helps keep the plantsUse 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 black color does not show the dirt as much.