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Mix at time of planting or soil amendment
Works great in EZ clone type setups
Auto shutoff conserves battery life
The temperature element is now embedded in the glass electrode for a faster response
17x28x1 Exact MERV 7 AC Furnace Filters 6 Pack meters-&-solutions Mix at time of plantingNordic 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
