20x25x5 (4 3/8) Lennox X6673_X6675 Replacement Air Filters MERV 14 Plus Carbon 4 Pack featured Perfecta BASE is used in

Perfecta BASE is used in each stage of the growing process

7 x QDPS Multi Flow | 1" T

We recommend that customers purchase our new Dual-Purpose Hybrid tumbler instead

It is ready to dilute in water and requires no pH adjustment

including auto-restart

20x25x5 (4 3/8) Lennox X6673_X6675 Replacement Air Filters MERV 14 Plus Carbon 4 Pack featured Perfecta BASE is used inImportant 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. We also carry 4 7 8 and 5 1 4 inch depth filters,