16_1/4x21_1/4x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack food-storage or a greenhouse grow setting

or a greenhouse grow setting

Reverse Osmosis “RO” or deionized water is not recommended

Using Insect Frass with mycorrhizae is highly recommended

Liquid Karma functions as a plant engine because its high metabolic activity produces a large amount of energy which is immediately transformed to growth

16_1/4x21_1/4x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack food-storage or a greenhouse grow settingNordic 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