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Covers the porthole so that evaporation of the nutrient solution is minimized
Visible improvements in root mass and plant vigor are typically observed within 2–4 weeks
Light Texture for Aeration and Drainage
Root development improved noticeably within the first week
14x16x1 MERV 7 AC Furnace Filters 6 Pack rock-bottom Covers the porthole so thatNordic 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
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