21_1/2x23_3/8x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Grow System/ Trays/ Reservoirs 0-hour REI (Re-entry Interval) &

0-hour REI (Re-entry Interval) & 0-day PHI (Pre-Harvest Interval)

Our double-ended lamps have less than 5% degradation and significantly increased PAR light production compared to single-ended lamps

premature flushes

4 RAW Kelp - 2 oz

by providing your plants with all the necessary components needed for strong development

21_1/2x23_3/8x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Grow System/ Trays/ Reservoirs 0-hour REI (Re-entry Interval) &Nordic 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