6x12x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Grow Tents Test pH every few drops

Test pH every few drops until the desired pH level is reached

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four seedling trays

6x12x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Grow Tents Test pH every few dropsNordic Pure Custom MERV 13 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition