17x28x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack spl_dakine420 In addition to its nutrient

In addition to its nutrient content

1 x Full Spectrum Quantum Sensor

Air and water reservoir: Its high total porosity gives very good root ventilation and oxygenation to plants

VermiFire performs above and beyond the call of duty

17x28x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack spl_dakine420 In addition to its nutrientNordic Pure Custom MERV 12 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