17_1/8x26_1/2x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack books • Low phosphorus levels help

• Low phosphorus levels help prevent excessive elongation

and other water-soluble heavy metals that can accumulate in your growing medium

Apply carefully and avoid overspray onto desirable plants

and in conjunction with Rootech Cloning Gel

and size options

17_1/8x26_1/2x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack books • Low phosphorus levels helpNordic 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