20x28x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Water Treatment Extreme Serene is especially effective

Extreme Serene is especially effective when used as a foliar feed

FloraFlex backs this controller with a 3-year warranty

Packing: 5 units per case

ice boxes and ducting dust free

and deeper into the plant foliage

20x28x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Water Treatment Extreme Serene is especially effectiveNordic 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