17x27x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Tents / Indoor Greenhouses It contains the naturally occurring

It contains the naturally occurring microbes Trichoderma harzianum strain T-22 and Trichoderma virens strain G-41

and will not affect the solubility

Diffused Technology to prevent shadowing

strawberry weevils

aerating the soil to allow easier root growth and improve water retention

17x27x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Tents / Indoor Greenhouses It contains the naturally occurringNordic 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