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It measures EC
• Apply as a standalone with water or tank mix with other nutrients
The JSFC2KT Jump Start Standing Lighting System is specifically designed to stand on its own over your plants
no ongoing chemical costs
13x21_3/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Meters & Solutions It measures ECNordic Pure Custom MERV 7 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition