9x13x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack lighting-&-electrical-components This 3-in-1 tester is unmatched

This 3-in-1 tester is unmatched in EC/TDS/ temperature measurements

binding and removing undesirable salts and heavy minerals

Grow Recipes

• Dimensions:

Safe to apply daily and will not interfere with plant development

9x13x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack lighting-&-electrical-components This 3-in-1 tester is unmatchedNordic 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