Clay pebbles and grow stones are both used to anchor plants in hydroponic systems. They can both be made pH neutral and allow for great root development. Grow stones tend to be lighter than clay pebbles resulting in slightly lower shipping costs and are made from recycled glass material. Grow stones offer a rougher texture, this forces roots to branch and develop more over clay pebbles. Both should be rinsed before initial use in order to pH balance them and to remove any loose particulate matter that might otherwise proceed through your hydroponic system. They can be cleaned and reused between growing cycles but this is usually not recommended.
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