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hydrogen sulphide and heavy metals in well water
whole house filter systems
This thriving colony of Ulocladium oudemansii provides protection from pathogens to fruit
Made for greenhouses in moderate to warm climates
20x25x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 6 Pack biological fertilizer hydrogen sulphide and heavy metalsImportant 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 20x25x4 filter
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