Black Ops Replacement Pre-Filter 10 in x 39 in White Grow Lamps The Bluelab® Combo Meter is

The Bluelab® Combo Meter is a conductivity

A powerful bloom booster designed to create bigger

Driest value-priced rockwool on the market

Equipped with an electronic safety device that protects the pump from dry-running

Eliminate odors safely and permanently with Ona gel

Black Ops Replacement Pre-Filter 10 in x 39 in White Grow Lamps The Bluelab® Combo Meter isUse 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.