13x23x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack Grow1 5' Steel Stake CalCarb helps in recovery by

CalCarb helps in recovery by increasing photosynthesis in the foliage that is not too seriously damaged and by raising the surface pH of damaged foliage which deters airborne pathogens form taking advantage of the weakened cellular tissue

Wilts & Blight

you can go back and forth 2-3 times

7 for optimal plant performance

Early Blight

13x23x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack Grow1 5' Steel Stake CalCarb helps in recovery byNordic 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