30x30x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack plant-support -FOR HYDROPONIC AND SOIL USE-

-FOR HYDROPONIC AND SOIL USE-

and oyster shell flour come from the sea and have all been added at precise ratios to give your valuable garden maximum nutrition

we give you control to supplement as needed without affecting primary fertility input ratios

When used according to directions

Humboldt Nutrients Grow formula

30x30x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack plant-support -FOR HYDROPONIC AND SOIL USE-Nordic Pure Custom MERV 14 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