21x23_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack grow-light-reflectors Low EC and stable pH

Low EC and stable pH

plus trace minerals to meet all your plants’ needs

It comes with a T-splitter and an additional water detector in order to have multiple points to detect water by using a single WD-1 module

• Automatic sun or electric light calibration modes ensure accurate readings no matter the source

Soy Extract

21x23_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack grow-light-reflectors Low EC and stable pHNordic 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