21x21x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack Master Controller Standard application: Use 4-8 ml

Standard application: Use 4-8 ml per gallon of water once per week or with every feeding

Add Killer Tea for even better results

Continue growing until your seeds are mature and then harvest and store them for future use

and other airborne particles

Complete and Balanced Formula: Delivers all necessary nutrients in one concentrated solution

21x21x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack Master Controller Standard application: Use 4-8 mlNordic Pure Custom MERV 14 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