13x21.5x1 Exact Size Air Filter Reflectors & Grow Lights Unlike other direct soil pH

Unlike other direct soil pH meters on the market

removable filter means you spend less time on maintenance and more time on your grow

and better air filtration with extended operation life beyond that of competitor brands

Trellis Netting can handle more weight while remaining taught and providing excellent support

The pH sensor in the probe is a single junction electrode with gelled electrolyte and a retractable cloth junction

13x21.5x1 Exact Size Air Filter Reflectors & Grow Lights Unlike other direct soil pHNordic Pure Custom MERV 10 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