20x25x5 (4 3/8) Lennox X6673_X6675 Replacement MERV 15 Air Filters 4 Pack Lighting & Electrical Components – Standard Dosage Rate: 1

– Standard Dosage Rate: 1 ML to 2 ML per gallon

Simply increase the base to increase your calcium levels

full spectrum for optimal plant health and vigor throughout the lifecycle

Use in conjunction with Trees and Micro for the best results

like in the morning

20x25x5 (4 3/8) Lennox X6673_X6675 Replacement MERV 15 Air Filters 4 Pack Lighting & Electrical Components – Standard Dosage Rate: 1Important 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,