20x20x4 (3 5/8) Pleated MERV 8 Air Filters 6 Pack chillers-heaters-and-purification Use to Raise the pH

Use to Raise the pH to the proper levels when pH is too low

Cocogro is a superior coir fiber because it is aged a minimum of 18 months and has finished its decomposition stage

rugged handles with reinforced stitching provide portability and greater weight support

The GC1 has a 0

Converts with a switch from sodium to halide

20x20x4 (3 5/8) Pleated MERV 8 Air Filters 6 Pack chillers-heaters-and-purification Use to Raise the pHImportant 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