Description
High red and blue spectral ratios for good photosynthesis efficiency
HLG BLACKBIRD is designed for home grows and is perfect for 4x4 grow tents
• Measures pH
Removes 99% of chlorine and 90% of sediment
it is visibly clear and leaves no residue
20x25x1 Pleated MERV 7 Air Filters 12 Pack Environmental Controllers High red and blue spectralNordic 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