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Graphite Sensor– Reduces polarization effects and does not oxidize resulting in a reliable and accurate reading
encourages rapid plant
and herbs will receive adequate nutrition during the vegetative and flowering stages
higher quality & more efficiency
15_1/4x15_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack spl_nextlight Graphite Sensor– Reduces polarization effectsNordic 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