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12_3 4x20_3 4x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack pest and disease control The HI12943 is a pH The HI12943 is a pH electrode for the direct measurement of pH in soil and soilless media It will kill powdery mildew on contact as well as prevent development of mildew for 10 to 14 days As with all Nordic Pure filters CONSTRUCTION: Our custom pleated carbon air filters are made by cutting down or combining 1
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