Cultiwool Substrate Block - 4'' x 4'' x 2.5'' - Full Case heat10 5" total length

5" total length

O-Rings are easy to change

New style is any heater made after 2006

even when all phone service is down

Cultiwool Substrate Block - 4'' x 4'' x 2.5'' - Full Case heat10 5" total lengthCultiwool 4'' x 4'' x 2. 5'' Blocks are commercial fabric blocks designed to grow crops in greenhouses and hydroponic operations. The fiber structure provides a superb air to water ratio, holds water longer, and enhances initial rooting. Features Superb air to water ratio A fiber structure that holds water longer Less resistance for the roots to grow in the block, resulting in better roots for "fragile" crops Fiber structure enhances faster initial