Glycerin bongs are a special type of water bong, they use glycerin instead of water or ice to cool and filter the smoke produced while smoking. Phoenix star glycerin bongs are filled with safe medical-grade glycerin that does not expand after freezing. The glycerin chamber or glycerin coil is typically detachable. It can be pre-frozen in the refrigerator for 1-2 hours or even more to enhance its cooling effect, allowing the glass bong to provide a smoother and cooler smoking experience.
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