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How do I know if my stone is dense enough for use with Gravel-Lok®?

How Do I Know If My Stone Is Dense Enough For Use With Gravel-Lok<sup>®</sup>?

Wear goggles.

Take pliers and squeeze the stone to break it. If it shatters like glass into chunks, that’s good, and you can use Gravel-Lok®.

If it pulverizes and creates a chalk-like dust, this is not good. Gravel-Lok® should not be used with this stone.