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.

Power showers and dual-flush toilets could be banned under Government plans to save water. Comes under plans to cut personal water consumption by 20 per cent in 15 years ...

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 ...

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.

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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, ...