13x23x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack grow-systems-trays-reservoirs and enjoy added benefits of

and enjoy added benefits of mycorrhizae (a beneficial fungi species that promotes root growth and enhances fertilizer uptake)

Flea Beetle (Chaetocnema confines)

commercial base nutrient formulated specifically for mother plants

PRO-MIX PURTM inoculants are designed to deliver proven results and are OMRI-Listed for organic growing

• Water resistant design

13x23x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack grow-systems-trays-reservoirs and enjoy added benefits ofNordic 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