Sir, - We have a water shortage, yet we flush a lot of it down the toilet, having gone to the trouble and expense of treating it in order to bring it to a potable standard. While working in other countries, I have seen one solution: two pipes into each home, one bearing potable water to the taps, the other bearing sea water to the toilet cistern. - Yours, etc., T.P. Murphy,
Stoneybatter, Dublin 7.