21_1/2x23_3/8x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack water-pumps-&-irrigation-supplies This encourages the rapid expansion

This encourages the rapid expansion of beneficial microbe colonies in the growth medium

Application Rates: The square footage below refers to surface area of the standing water

Leafminers

containers and countertops

21_1/2x23_3/8x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack water-pumps-&-irrigation-supplies This encourages the rapid expansionNordic 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