20x20x4 (3 5/8) Pleated MERV 12 Air Filters 2 Pack grow-systems-trays-reservoirs All-natural biological plant extract to

All-natural biological plant extract to boost the plant defense mechanisms against certain fungal and bacterial diseases to improve overall plant health

Available in two models with transfer capacities of 1479 GPH (AAPC1010) and 2166 GPH (this model

Water in weekly

-based after-sales service

If your Ph is getting too high

20x20x4 (3 5/8) Pleated MERV 12 Air Filters 2 Pack grow-systems-trays-reservoirs All-natural biological plant extract toImportant Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air conditioner filter. It's best if you measure your air filter for the EXACT size and compare it to our "Actual Size" and then you can be sure your A C air filter fits! With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer. If you are replacing a 4 3 8 depth 20x20x4 filter