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The flush toilet operates on a somewhat different principle. You might not be as popular in the US as the siphon toilet. However, this style of toilet flushing technology is used in many European toilets. Benefits of washdown toilets include: 1. It is very easy to install; all you need is a water pipe. 2. The direct flush toilet has a strong capacity for sewage discharge, a fast flushing speed, and a huge water flow because it generates thrust using compressed air.