21_1/2x23_5/16x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Lighting The HumTea Brewball enables gardeners

The HumTea Brewball enables gardeners to create potent liquid fertilizers

The built-in temperature sensor ensures every reading is adjusted for environmental changes

Ideal for Veg and Bloom

• OMRI Listed and Compliant for use in organic farming

With the Bluelab Guardian Monitor monitoring your crops 24 hours a day and with the ability to set high and low alarms

21_1/2x23_5/16x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Lighting The HumTea Brewball enables gardenersNordic 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