21x21x1 MERV 7 AC Furnace Filters 6 Pack Trimming Shears Potassium helps improve the quality

Potassium helps improve the quality of your plant’s flowers and starch production

The small and precise flow of the MP810 provides fully automated pH control of aqueous solutions in the hydroponic systems

Overall the knife measures 9-inches

Performance of combustion chamber¹: 23 kW / 30

Frequency : 50/60HZ

21x21x1 MERV 7 AC Furnace Filters 6 Pack Trimming Shears Potassium helps improve the qualityNordic 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