20x23x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Grow Light Ballasts Whole-house filter or stand alone

Whole-house filter or stand alone (with optional garden hose connection kit HL26010)

Use Microbe Brew on your ornamental flowers

thereby making the root system more efficient when absorbing nutrients and water

but they also eat aphids

20x23x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Grow Light Ballasts Whole-house filter or stand aloneNordic 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