22x30x1 MERV 13 AC Furnace Filters 6 Pack New-releases Active Aqua air stones are

Active Aqua air stones are an ideal way to add oxygen to your hydroponic growing system

Features a round collar on the backside to attach ducting

Compatible with all growing mediums

and natural resistance to environmental stress

1/2 tablespoon

22x30x1 MERV 13 AC Furnace Filters 6 Pack New-releases Active Aqua air stones areNordic 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