15x30_3/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Water Heaters Chillers 2 pH Accuracy

2 pH Accuracy

Maintains results after multiple growth cycles

EZ-CLONE Cloning collars are available in 17

Premium polymer lenses with 100% UV protection and a flash silver exterior lens coating

No synthetic chemicals – glyphosate-free

15x30_3/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Water Heaters Chillers 2 pH AccuracyNordic Pure Custom MERV 12 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