18x22x1 MERV 10 Plus Carbon AC Furnace Filters 12 Pack X Nutrients has no on/off buttons to

has no on/off buttons to worry about and does not need calibrating

you usually need additives to achieve desired levels for your plants

Intake Connection:  1/4" SAE

While different companies use different scales to measure the air filter’s efficiency

Increase rate to 5-10 mL per gallon water for combatting severe reservoir and growing media conditions

18x22x1 MERV 10 Plus Carbon AC Furnace Filters 12 Pack X Nutrients has no on/off buttons toNordic Pure pleated AC air filters are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home or office. Each time air passes through a Nordic Pure pleated furnace filter, lint, household dust, pollen, dust mites, pet dander, baking flour, mold spores and other contaminants are removed. Our filter media prevents the growth of bacteria or mold, resulting in a much healthier living space.