How to Make Sea Glass in a Concrete Mixer

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    • 1). Break the mosaic glass into pieces of the desired size. Use old glass bottles or dishes for a more authentic sea glass look. Fill the barrel of your rock tumbler three-quarters full of glass pieces.

    • 2). Add just enough water to the barrel to reach the same level as the glass without fully covering it. Add 4 Tbsp. grit to the water and close the barrel tightly.

    • 3). Place the rock tumbler on a flat surface and let it tumble for seven to 10 days. Take the barrel outside and dump the contents into a strainer. Use a garden hose to thoroughly clean the glass pieces.

    • 4). Repeat the tumbling process with a finer grit to achieve a more polished, glossy look.

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