16_1/4x21_1/2x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Controllers This plant fertilizer is derived

This plant fertilizer is derived from 100% microalgae that have been carefully cultivated using innovative and sustainable production methods

multi-stacked

a jar test is highly recommended before applying this product

Instant-ON

16_1/4x21_1/2x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Controllers This plant fertilizer is derivedNordic Pure Custom MERV 12 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