6x20x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack jg They have a higher blue

They have a higher blue spectral ratio enhancing Veg and growth

which indicates that the electrode is working properly and when it needs to be cleaned or replaced

4 cm W x 10

making it a must-have for NOP-compliant or Organic-Focused systems

Indoor/outdoor plants

6x20x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack jg They have a higher blueNordic Pure Custom MERV 10 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