21x23_1/2x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack pots Works great for both soil

Works great for both soil and hydroponic situations

Rain-Fast Formula – Remains effective after rain events

The 710 pulls 200 more pints per day on a 30 amp circuit than any other unit on the market

BalEnce Fly Spray maintains a residual effect in the treated areas for up to about 21 days

From the classic three-part formula

21x23_1/2x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack pots Works great for both soilNordic Pure Custom MERV 8 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