28x30x4 (3 5/8) Pleated MERV 12 Air Filters 1 Pack Tents / Indoor Greenhouses It contains a coarse coir

It contains a coarse coir fiber mat on the bottom of the block to allow for free drainage and to keep coir fiber particles from draining out of the bag

much better than traditional HPS grow systems

2 Removable trays

but Azadirachtin also works as a molting/growth disruptor

Air pruning prevents your plants from becoming root-bound

28x30x4 (3 5/8) Pleated MERV 12 Air Filters 1 Pack Tents / Indoor Greenhouses It contains a coarse coirNordic Pure 28x30x4 Pleated Air Filters MERV 12 are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home. Each time air passes through a Nordic Pure pleated furnace filter, lint, household dust, pollen, dust mites, pet dander, smoke particles, virus carriers, bacteria, mold spores and other contaminants are removed. All Nordic Pure pleated air filters are manufactured using a heavy