23 1/2x25x1 Exact MERV 14 AC Furnace Filters 6 Pack tents-&-tarps the pH controller measures the

the pH controller measures the pH value of the solution and automatically adds pH adjustment (acid or alkaline) to change the liquid's pH to the desired selected level

DO NOT Freeze

• LED emergency indicator light

and vigorous growth

Use with Athena Pro Core for a complete and balanced recipe

23 1/2x25x1 Exact MERV 14 AC Furnace Filters 6 Pack tents-&-tarps the pH controller measures theNordic Pure MERV 14 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 14 furnace filters are comparable to HVAC filters with the rating of MPR 2800.