23 1/2x25x1 Exact MERV 7 AC Furnace Filters 6 Pack PH/EC/TDS Meters and Solutions This switchable magnetic ballast is

This switchable magnetic ballast is compatible with 1000W MH and HPS bulbs (make selection using the switch) and runs at 120V or 240V

Versatile—can be used for many different applications

L-amino acids improve the absorption rate of your favorite fertilizers by chelating essential nutrients and making them more available to your plants

000 rated initial lumens

23 1/2x25x1 Exact MERV 7 AC Furnace Filters 6 Pack PH/EC/TDS Meters and Solutions This switchable magnetic ballast isNordic Pure MERV 7 Pleated AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Each time air passes through a Nordic Pure pleated furnace air filter, lint, dust, pollen, bacteria, pet dander, dust mites, mold spores and other contaminants are removed. MERV 7 furnace filters are comparable to HVAC filters with the rating of MPR 600. While different companies use different scales to measure the air filters