15_1/4x15_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack spl_nextlight and herbs will receive adequate

and herbs will receive adequate nutrition during the vegetative and flowering stages

pH-Up and pH-Down adjust the acid/alkaline balance of your water

higher quality & more efficiency

Graphite Sensor– Reduces polarization effects and does not oxidize resulting in a reliable and accurate reading

encourages rapid plant

15_1/4x15_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack spl_nextlight and herbs will receive adequateNordic 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