15x23x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Hydro Systems Some competing nutrient lines offer

Some competing nutrient lines offer a (16-0-0) formula as a one-part grow fertilizer

- OMRI listed

seek medical advice immediately and refer your doctor to the contents of this product

Bluelab pH 7 and Bluelab pH 4 Solution Sachets are now included

15x23x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Hydro Systems Some competing nutrient lines offerNordic Pure Custom MERV 10 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