16x20x4 (3 5/8) Pleated MERV 7 Air Filters 6 Pack controllers Root Royale Cocopure and Cocolite

Root Royale Cocopure and Cocolite are RHP certified and have very low EC values

Hands-free monitoring and dosing of solution pH levels

HumTea Brewball Including 5-gallon HumTea Brewkit

Fits up to a men’s size 12 shoe or size 11 boot

Available Phosphate (P2O5) 1

16x20x4 (3 5/8) Pleated MERV 7 Air Filters 6 Pack controllers Root Royale Cocopure and CocoliteImportant 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 16x20x4 filter