Aquaponic Gardening

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Hi,guys I'm a newbie,I live in India,Bangalore and in Bangalore people sells cinder(lava rock) locally 20kg for $4 but I'm stuck to buy it bcz I'm confused it is inert or not so do I buy it

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Lava rock is used a lot in Hawaii.

A vinegar fizz test will show with certainty whether it should be used.  Search vinegar on this site.

Thank u George yeah I watched videos on YouTube and my cinder is not bubbling

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