20x22_1/4x1 Exact MERV 14 AC Furnace Filters 6 Pack Master Controller Specialized for the direct pH

Specialized for the direct pH measurement of soil

What’s special about carbon

Natular G30 WSP is an organic formulation that breaks down quickly in the soil and degrades rapidly in sunlight

The compensation coefficient and EC/TDS conversion factor are user-selectable from 0

* High-quality

20x22_1/4x1 Exact MERV 14 AC Furnace Filters 6 Pack Master Controller Specialized for the direct pHNordic 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.