20x20_1/2x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack Amendment Slightly higher PAR for better

Slightly higher PAR for better flower density

Bio·Grow® is a liquid growth fertilizer which can be applied to most types of soil and substrate mixtures

pH Resolution: 0

• Number of Tumblers: 2

Place your PotPro™ 4" Cube into the Pot

20x20_1/2x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack Amendment Slightly higher PAR for betterNordic Pure Custom MERV 8 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