General Hydroponics pH Control Kit

Gro-Blocks - 4 in. x 4 in. x 4 in. (Rockwool / Stonewool) Grodan

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This is a strip of six 4 in. x 4 in. x 4 in. Gro-Blocks, each with pre-formed holes.

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This is a strip of six 4 in. x 4 in. x 4 in. Gro-Blocks, each with pre-formed holes.

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General Hydroponics pH Control Kit