14_1/2x19x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Growing Accessories or some heavy fertilizers you're

or some heavy fertilizers you're pouring

You need to add nutrients when you first water the substrate (use your nutrient supplier's recommendations)

Highly recommended

and bad taste from drinking water

– Extended life of trays and custom tables

14_1/2x19x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Growing Accessories or some heavy fertilizers you'reNordic 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