8x18x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Water Filtration This will insure vigorous and

This will insure vigorous and healthy new growth

Full spectrum white and 660nm red

Automatic shut-off options are to turn the meter off after 8 minutes

SNS 203's concentrated active ingredients attack fungus & algae and cause pests to dehydrate and dry up

Biomin Calcium is suitable for soil or foliar applications and will not harm plants when applied according to directions

8x18x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Water Filtration This will insure vigorous andNordic 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