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No probe changes are required when switching your measured parameter between pH
Root Drench
Heavy-Duty steel construction with spiral fan guards
Mini-Blocks sit in a tray (flat) without support for easy starting of seeds and cuttings
21 1/2x26x1 Exact MERV 14 AC Furnace Filters 6 Pack harvest-solution No probe changes are requiredNordic Pure MERV 14 Pleated AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Each time air passes through a Nordic Pure pleated furnace air filter, lint, dust, pollen, bacteria, pet dander, dust mites, mold spores, smoke particles, virus carriers, coughs and sneezes, smog, allergens and other contaminants are removed. MERV 14 furnace filters are comparable to HVAC filters with the rating of MPR 2800.
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