20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 13 Plus Carbon 1 Pack Trimming Shears The Phosphorus Acid works systemically

The Phosphorus Acid works systemically inside the targeted pathogens to inhibit certain essential metabolic actions and to block enzymes vital to their growth

Most standard PK boosters are structured

Product Includes:

60ml Amber glass tincture dropping bottle with graduation - BLACK CAP ONLY

Highly flexible – can be applied in standard foliar spray applications or in tank mixes

20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 13 Plus Carbon 1 Pack Trimming Shears The Phosphorus Acid works systemicallyImportant 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,