23x25x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack trays The Hydro-x allows separate Day

The Hydro-x allows separate Day and Night settings for each of up to (4) TS  modules

The system blocks light and keeps the top of your medium moist for a more even dry down

which is the perfect amount to stick 50 cuttings

a human hair is about 70 microns wide

Root mass was noticeably larger and plants handled stress much better than previous runs

23x25x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack trays The Hydro-x allows separate DayNordic 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