Share 'Another awesome and sustainable alternative to Hydroton! - "Growstones"'
made from recycled glass bottles and produced from waste gasses at landfills in the USA!
this stuff is lightweight like expanded shale/clay, but slightly cheaper and with better water/air retention properties. at $30 for 35L(1.25cuft) it is $0.86/L, better than hydroton at $58 for 50L, $1.16/L.
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