16x18x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack biological fertilizer Two separate set points can

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

Formulated from various plant materials and subjected to a fermentation process

Never cut the asparagus spears within 2 inches of the crown to avoid damage to the developed buds

Full Spectrum 6400K Grow Lights (T5HO)

16x18x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack biological fertilizer Two separate set points canNordic 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