18x18x1 Pleated MERV 13 Air Filters 12 Pack dis Allows quick access to the

Allows quick access to the reservoir for maintenance of the nutrient solution such as checking pH

2mm inlet - 2 small holes (best for thinner oils)

Using a sharp knife or razor blade

but worm castings brewed into a tea are excellent for hydroponic root drenches and foliar applications

18x18x1 Pleated MERV 13 Air Filters 12 Pack dis Allows quick access to theNordic Pure MERV 13 Pleated AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Each time air passes through a Nordic Pure pleated furnace air filter, lint, dust, pollen, bacteria, pet dander, dust mites, mold spores, smoke particles, virus carriers, coughs and sneezes, smog, allergens and other contaminants are removed. MERV 13 furnace filters are comparable to HVAC filters with the rating of MPR 2200