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Who has retrofitted an old toilet to low-flow/dual flush? x-post

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Posted by drbeanie2000 (My Page) on
Mon, Mar 19, 12 at 15:32

Experiences? Our toilets are the originals to our 1954 house, and we want to keep them. Can they be transformed into more water-saving devices?

beanie

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RE: Who has retrofitted an old toilet to low-flow/dual flush? x-p

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NO- the amount of water required to effect a flush is determined by the diameter, height & shape of the trapway in the bowl. Simply changing to a tank that would feed less water will not work.

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RE: Who has retrofitted an old toilet to low-flow/dual flush? x-p

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The toilet manufacturers tried all sort of changes to bowl shape to make the low flow toilets function (and some 'sort of' function, while others require more than one flush, negating any water savings except a VERY old toilet).

The bowl and paths from tank to bowl all got changed.

You need to make sure any change you make ensures that the bowl (and the concealed s-trap) are filled after flushing.

There are actually standards about how much water must be in the trap to make an effective seal.

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RE: Who has retrofitted an old toilet to low-flow/dual flush? x-p

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I'm not sure if low-flow and dual-flush kits are the same or different, but on the latter I did try to retrofit an original 1961 American Standard toilet with a dual-flush retrofit kit. The kit is similar to a toilet tank repair kit and replaces the toilet flap and handle inside the tank.

Anyway didn't work, as the original flap contraption included this large metal piece that looked like it couldn't be removed without lifting the tank off the bowl, and I didn't want to risk taking apart the entire toilet.

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