Black Ops Replacement Pre-Filter 12 in x 48 in White Sierra Natural Science (SNS) Pro-TeKt® is a replacement for

Pro-TeKt® is a replacement for the silica normally found in all soils (typically 5 - 10 ppm)

Used throughout the bloom stage

A powdery mildew fungus is an obligatory parasite and thus requires a living plant host

The Transporter offers an ultra-functional

Black Ops Replacement Pre-Filter 12 in x 48 in White Sierra Natural Science (SNS) Pro-TeKt® is a replacement forUse 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.