16x18x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack biological fertilizer Formulated from various plant materials

Formulated from various plant materials and subjected to a fermentation process

Two separate set points can be adjusted from 4 to 7 pH and 900 to 1800 ppm (mg/L)

Full Spectrum 6400K Grow Lights (T5HO)

plug and play"

16x18x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack biological fertilizer Formulated from various plant materialsNordic 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