22x23x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Grow Strong Designed for the flowering phase

Designed for the flowering phase to promote dense

Recommended Max CFM: 2200 CFM

but are on a tight growing budget

Guard ‘n Spray can be diluted for maintenance or preventative treatments at 15 ml of concentrate per gallon

Note beginning reading and then test pH

22x23x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Grow Strong Designed for the flowering phaseNordic 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