15x24x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Grow System/ Trays/ Reservoirs Special soluble non-acidifying sulfur provides

Special soluble non-acidifying sulfur provides increase in chlorophyll formation and availability of potassium

The Ona odor neutralizing agents are released in a controlled manner so that every molecule is fully optimized

If the rejection % falls under an acceptable level (typically 90%) it’s time to change the membrane

Warranty : 5 Year Standard Warranty

15x24x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Grow System/ Trays/ Reservoirs Special soluble non-acidifying sulfur providesNordic 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