21x23_1/2x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack complete grow kit De-Ionization Cartridge (Big):

De-Ionization Cartridge (Big):

the ONA Mist Dispenser can be placed anywhere

For use in soil

Can be tank mixed after testing for compatibility and plant sensitivity

21x23_1/2x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack complete grow kit De-Ionization Cartridge (Big):Nordic 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