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I'm interested in fitting a water-softener (specifically, the Twintec S3, which is a dual-cylinder unit developed in the UK, apparently) to my home. My home is over 3 stories, with a bathroom on the middle floor and an en-suite on the top floor.

The bathroom has a toilet, basin, and (large - 180cm x 80 cm) bath. The en-suite has a shower, basin, and toilet.

Hot water is provided by a combi-boiler; I think it's an Ikon 23t or something similar to that.

I don't know the specific flow-rates of things, but... if the water softener has 2 cylinders of 17 litres each, how will I not run out of water during long showers or filling up the bath? This specific water-softener is supposed to regenerate in 10 minutes, and is supposed to be able to regenerate while the other cylinder is supplying. But... If a tap runs at 5l/min, and a cylinder holds 17l, then one cylinder will be drained after ~3m20s. Then the other one will be too, shortly thereafter.

Am I missing something? Do I have the cylinder-size wrong, or the regeneration-time...?

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Impossible to answer w/o flow rates. – The Evil Greebo Aug 27 '12 at 19:39
up vote 1 down vote accepted

As Evil said impossible to tell you from the info you have provided, but if you look at the specs of the Twintec S3 it runs at 65l/m max flow rate and uses 17L per regeneration cycle ( eg wasted water)

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Thanks; where did you find those specs? I had a hunt for such things, but couldn't find them. Perhaps I confused 17l per regeneration cycle with 17l per cylinder...? – Peter Mounce Aug 28 '12 at 9:01

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