13x23x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack rockwool Use Big Bloom throughout all

Use Big Bloom throughout all growing cycles to heal root systems and increase nutrient cycling

While the added IR in the far red end of the spectrum increases the metabolism of the plant

Proprietary formulation that offers superior pH control

Pura Vida Grow & Bloom contain sufficient nitrogen

13x23x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack rockwool Use Big Bloom throughout allNordic Pure Custom MERV 7 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