In article 95006aec-d365-4ce9-9396-878f0e27eba8
@p12g2000vbo.googlegroups.com, says...
there are several possibilities. Buying a japanese toilet set would
seem most logical, especially given their advantages. But if you
wanted to cobble something together with british components, the
easiest option is just to turn the fill valve down slower.


http://www.scalewatcher.co.uk/blog/i...ave-water-use-
toiletsink-appliance/

--
Skipweasel - never knowingly understood.