10x36x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack Travel Bags & Backpacks These growing blocks are used

These growing blocks are used for direct sowing or "blocking on" of Macro and Multiblock raised plants

Easy Set Up Instructions

Cartridges come in all shapes and sizes

Perfect for all Tanks 50-3000 gallons and a MUST-HAVE for any Feed Tank over 5 feet tall

mixed with white

10x36x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack Travel Bags & Backpacks These growing blocks are usedNordic Pure Custom MERV 7 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