13x23x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack grow-systems-trays-reservoirs commercial base nutrient formulated specifically

commercial base nutrient formulated specifically for mother plants

Patent pending lead wires provides a sturdy lamp for safer connection within the DE socket

Rich Humic lab results show 22% humic acid through the alkaline extraction method and 3% humic acid through the acid-insoluble method

The Gavita Master Controller EL3 is the next generation in our EL controller series

13x23x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack grow-systems-trays-reservoirs commercial base nutrient formulated specificallyNordic 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