Dual-flush toilets use a drop valve system to evacuate waste and water. But the valve can get stuck open by mineral deposits or other debris, causing the toilet to fill continuously.

Dual-flush toilets usually have a mechanical valve with a rubber seal in the cistern that opens to allow water to flow when flushed. That rubber seal can rapidly deteriorate, says Tucker.

Dual-flush toilets have been growing in popularity since their drop valve mechanism was approved in 2001. They are supposed to save water by allowing users to choose a short flush to get rid of ...

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In our tests of single- and dual-flush toilets, the ones with the top Overall Scores in our ratings were midpriced models, costing from around $200 to about $350.

Most dual-flush toilets use a drop valve system, which was allowed onto the UK market back in 2001 due to a change in regulations. The Bathroom Manufacturers Association (BMA) admits the drop ...

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Dual-flush toilets were invented to save water by using less water for liquid waste than solid waste, but their water efficiency isn't guaranteed.

Dual-flush toilets are wasting more water than they save, according to a report in the BBC, ... This issue is related to the drop valve system used in most dual-flush toilets, ...