18x24x1 Pleated MERV 7 Air Filters 3 Pack grow-system/-trays/-reservoirs This narrow electrode easily fits

This narrow electrode easily fits into test tubes

Hangs plants vertically for even drying

General Application Rate: 1-5 ml per gallon of water or nutrient solution

which is vital for strong root development

18x24x1 Pleated MERV 7 Air Filters 3 Pack grow-system/-trays/-reservoirs This narrow electrode easily fitsNordic 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