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Rockwool 101 – Ebb and Flow – Flood and Drain with Grodan – Part 7

Rockwool 101 - Ebb and Flow - Flood and Drain with Grodan - Part 7

Cultivating with Stonewool / Rockwool. Preparations and procedures. Covers EC and pH. http://www.growex.co.uk

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Growex

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