15x17x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Growing Media Do not use at full

Do not use at full strength to avoid deterioration of equipment components

* Quiet Operation

Use it as a stand-alone product or combine it with FoxFarm's Light Warrior Agro-Ponic Grow Medium

- Trim up to 7 units/hr

Chemboys PH Down Max is the most potent and cost-effective ph Up solution available on the market today

15x17x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Growing Media Do not use at fullNordic Pure Custom MERV 13 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