21x23x1 Exact MERV 12 AC Furnace Filters 6 Pack Grow1 5' Steel Stake Buffer against salt and high

Buffer against salt and high EC conditions associated with poor soil or heavy feeding

The Magnum Inverter technology ensures lower operation costs

This reduces application frequency and risk of nutrient burn

Order enough to treat the full infested area

Adaptable to All Soil Media Types Stake or rod mount options available

21x23x1 Exact MERV 12 AC Furnace Filters 6 Pack Grow1 5' Steel Stake Buffer against salt and highNordic Pure MERV 12 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, allergens and other contaminants are removed. MERV 12 furnace filters are comparable to HVAC filters with the rating of MPR 1500 1900. While different