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Single use so that fresh solution is always used for accurate calibration
is well suited as a mix-in element with other growth mediums
herbs and forest tree seedlings grown in greenhouses
• Only 3 formulas to statisfy all growing methods
16x25x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 13 Plus Carbon 4 Pack spl_hw Single use so that freshImportant 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,
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