17_1/4x17_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Trimmers The Grow-Cubes do not need

The Grow-Cubes do not need to be changed

AI21040 - GroStar GS4 pH/EC/500ppm/700ppm & Temp (5-in-1) Combo Pen

Bio·Grow® is a liquid growth fertilizer which can be applied to most types of soil and substrate mixtures

AnthoSpec: 44W

Improves uptake of mineral nutrients

17_1/4x17_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Trimmers The Grow-Cubes do not needNordic 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