20x22_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack food-&-water-storage ROOT ROYALE™Hydro Clay Pebbles are

ROOT ROYALE™Hydro Clay Pebbles are an environmentally friendly grow medium that can be reused over and over again

Ideal for landscapers

This means harmful vapors and strong odors are trapped and neutralized

Accurate dual-beam CO2 sensor

20x22_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack food-&-water-storage ROOT ROYALE™Hydro Clay Pebbles areNordic 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