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Crushed Black Granite Works as Grow Media

In a flood and drain style Aquaponic system where a grow bed is flooded and then drained to mimic the natural cycles in an estuary, the plants need to root in a sub-strate, also known as media. There are many choices for media including: pea gravel, washed river rock, expanded clay balls (commercially known as Hydroton) and expanded shale. In Western PA, crushed gravel and river rock are problematic because of the limestone content which can wreck your fish tank’s water chemistry by the chemicals that naturally leach from the rocks. The media needs to be pH-neutral Hydroton and

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