20x23x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack spl_hi the pH controller measures the

the pH controller measures the pH value of the solution and automatically adds pH adjustment (either acid or alkaline) to change the liquid's pH to the selected level

quality and colors of the end product

ONA's active ingredients come from a blend of 32 essential oils and plant-derived compounds that bond with and neutralize a wide array of odors

improving plant growth and shelf life

and they feature highly precise microprocessors

20x23x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack spl_hi the pH controller measures theNordic 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