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HG "liquid drain unblocker" is a unique and safe, but extremely powerful drain unblocker that offers many advantages. It does not have to be diluted, thus reducing the chance of splashing. HG "liquid drain unblocker" does not foam or splash when poured into the drain. Leave the liquid to penetrate and after 30 minutes the blockage will be clear. Unlike other granular unblocking agents, this liquid drain unblocker cannot make the blockage worse and does not harm plastic drain pipes.