Most popular hydroponics grow medium Rockwool are derived from volcanic rock (basalt) melted back into lava and poured into a spinner in a process similar to making cotton candy. Rockwool is clean media which has a perfect air-water ratio and comes in a ready to use cube format. Smaller Rockwool cubes are used for germinating seeds for seedlings and larger cubes are used as the primary growing medium for small plants. Rockwool has high ph, so it should be pH balanced before use.


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