Each time the toilet cistern is flushed, between eight and ten liters of water are consumed, an excessive and unnecessary amount particularly when considering that said expenditure is often aimed at disposing of wastes and residues that should have been thrown away in the paper bin such as paper, cigarette buds, etc. Due to its composition and utilization, the water saver for cisterns enables very easy and considerable daily savings of water since it makes it possible to flush water depending on the given need. By closing the flush valve of the cistern at a precise moment each time the cistern flush lever is actuated, it is possible to save 25 liters of water per person without said person being deprived of water. The water saver for toilet cisterns can be used in any type of toilets having a conventional mechanism in the cistern.
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