Grodan 4x4x4" Rockwool Grow Block Improved size:6/Pack such as the Combo Meter

such as the Combo Meter and Guardian Monitor

These will let you know whenever your ph parameters are out of range

Store closed and in a dark and frost-proof place

Highest output

Grodan 4x4x4" Rockwool Grow Block Improved size:6/Pack such as the Combo MeterNew Grodan 4x4x4" Block Improved! Improved product at current pricing. New density + new hydrophilic technology = better water distribution and root development. The uniform distribution of water and nutrients throughout the block allows for more efficient use of the entire substrate volume Full saturation of the blocks with no dry spots and improved EC control with less water is achieved in the rootzone due to the uniform, optimized wool resulting in