17_1/2x17_1/2x1 Exact MERV 8 AC Furnace Filters 6 Pack micro-nutrients In just one glance it

In just one glance it clearly conveys all 3 critical parameters for successful growth: pH

Perlite and Dolomite Limestone (pH adjuster)

Red 2" x 0

Bloom: 14 ml/gallon

17_1/2x17_1/2x1 Exact MERV 8 AC Furnace Filters 6 Pack micro-nutrients In just one glance itNordic Pure MERV 8 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 and other contaminants are removed. MERV 8 furnace filters are comparable to HVAC filters with the rating of MPR 800. While different companies use different scales to measure the air filters