21x21x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack Growing Media making the growth chamber excellent

making the growth chamber excellent for small scale isolation research

such as reducing Calcium and Magnesium availability

transparent cover

Yellow Scale)

Rare Dankness Perfecta VEG contains essential nutrients for the vegetative growth cycle

21x21x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack Growing Media making the growth chamber excellentNordic 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