Fire glass is tempered with dull edges. It comes in many different colors and when combined with fire it often has the illusion of being wet. It doesn’t burn but it does a decent job of retaining heat.
You can find fire glass with a simple internet search. There are many suppliers out there.
If you’d like to save a few bucks, put some lava rock down first and cover the last few inches with glass.
If you’d like to save a few more bucks (and source your materials the old fashioned way: with a phone book) seek out a local glass blower. They usually have a good amount of waste they’d otherwise throw out, and likely, would much rather give it to a diy-er like yourself. If you go this route, run your fire pit for at least an hour and keep your distance before inviting your friends to hang out around it. If there are impurities in the glass it could pop the first time it heats up.
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