16_1/4x21_1/2x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack nutrient-combo Replace the pack when the

Replace the pack when the indicator signals depletion or when the pack becomes rigid and hard

PEI body offers increased durability

leaving no residual impact on the environment

BLOOM is a Phosphorus heavy formula for enhancing flower production

Used alone or with existing soil to rejuvenate it

16_1/4x21_1/2x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack nutrient-combo Replace the pack when theNordic Pure Custom MERV 10 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition