RedRock® Grow Block PRO w/ 42/40 Hole, 6" x 6" x 5.3" (48/Case) Bulb the water content of the

the water content of the block can be controlled with great precision

Easy to use

Recommended for use with Phresh & Black Ops Carbon Filters

Copper Sulfate

RedRock® Grow Block PRO w/ 42/40 Hole, 6" x 6" x 5.3" (48/Case) Bulb the water content of theOne Case (48 pcs.) RedRock Grow Block PRO w 42 40 Hole 15x15x13. 5cm 6 Inch x 6 Inch x 5. 3 Inch Commercial grade PRO Stone wool grow blocks sourced and manufactured in North America Stone wool grow blocks are made in the USA RedRock Stonewool grow blocks PRO are priced for commercial agriculture production Stone wool has high fiber density makes better use of water and fertilizers while allowing dry back Sizes available for any crop