23_1/4x29_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack grow media Begin applications before pest populations

Begin applications before pest populations establish for best results

This nutrient system works well in hydroponics

Continue your journey to becoming a master cloner with a commercial grade cloning machine

Ultrasonically bonded edges provide improved product strength and integrity

bio-active form known as Monosilicic Acid

23_1/4x29_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack grow media Begin applications before pest populationsNordic 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