18x27x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack rock-bottom 1-2 teaspoons per gallon of

1-2 teaspoons per gallon of water 3-4 times per week

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Water Detectors Max 5pcs per set

Nordic Pure 16x24x2 MERV 12 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer

18x27x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack rock-bottom 1-2 teaspoons per gallon ofNordic Pure Custom MERV 8 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