Concentrated formula is easy to use, really works, and won’t affect the taste of your hit! Just add a few drops of Rez block to your water and this stuff will really keep your bong clean! How? Using fruit and vegetable extracts that create a natural and slippery coating that resin can’t stick to! The resin stays in your water rather than sticking to your waterpipe, perc, or downstem. Safe for you and the environment!