20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 8 Pleated Plus Carbon 2 Pack Hydro Systems Calcium also keeps nutrients moving

Calcium also keeps nutrients moving throughout the plant

It can be used during in all stages of growth

• Add 1 cup per 50 gallons of water (strain for drip systems)

Ancient Amber was designed for all phases of plant growth and bloom

112 x Drip Shield 2

20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 8 Pleated Plus Carbon 2 Pack Hydro Systems Calcium also keeps nutrients movingImportant 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,