Water shortage is a serious problem all over the world. Everyday people use toilet many times and waste lots of water. Some toilet water tank uses half tank of water to flush the pee, but toilet still uses lots of water. In some area without water supply, restroom is very dirty without flush water. This invention can solve those problems with very low cost.;Currently, sewage water is discarded after people take shower, wash hands, clothes or food. If the discarded sewage water is collected, filtered and purified, it can be used as toilet flush water. The key factor for this invention is that the water for flushing the toilet does not require high purified quality, so the cost of filtration and purification is very low. This invention could save 30%-60% of the water used in daily life. For the existing building, this invention requires minor modification to separate the water pipes for toilet flush from other usage on both supply and discharge.;This invention also provides a cheap solution for the movable restroom or restroom without water supply pipe system. With two water tanks, one for water supply and one for sewage water collection, the toilet can be flushed with the discharged sewage water after simple filtration and purification with the initial water filling in the water tank.
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