Gravity-flush toilet

Gravity-flush toilet

A toilet whose flush is powered solely by the force of falling water.
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Some consider pressure-assisted toilets noisy, although Love says the whoosh of a pressure-assist is just unfamiliar compared to the gurgle of a gravity-flush toilet.
Both David Del Porto and Terry Love recommend the Toto gravity-flush toilet, pictured at left.
Gravity-flush toilets are the most common, have the simplest design and are usually the least expensive, ranging in price from $50 to $420.
Some new water-saving toilets are equipped with a pressure-producing device that improves flushing (it is called the Sloan Flushmate), but this device can't be retrofitted on existing gravity-flush toilets.
While they are usually less effective at removing solid waste than pressure-assist toilets (described below), gravity-flush toilets are generally less expensive and easier to maintain, because most use standard parts.
Pressure-assist toilets have a distinctive whoosh sound that's much louder than gravity-flush toilets, but they are more effective in removing solid waste.
Gravity-flush toilets, the kind that cost under $200, ``paled in comparison, often requiring two flushes to do the same job.