Hydroton Alternatives...?

70's natureboy said:

Those are my favorite rocks too. I also like them mixed with hydroton. They last for years. The Growstones are too light, and float in my ebb and flow, and too light for much support in small netpots. They also crumble if you step on them.

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I started out with dyna gro Roks II . Talk about expensive, cleaning for reuse was a bitch too but they cost so much I wasn't about to throw them out.
The silica benefits from them I think are probably near to none and that's one of the things they boasted.
With a 65 pound bag of sunleaves rocks at 20 bux or so they're easy to toss out somewhere they might fit in and grab a new bag or two for the grow.

just got theese
$5