Sunbeam appliances retail a cannister of water treatment resin to demineralise water for use in their steam irons. They say that each cannister will treat up to 30 litres of water. You fill the cannister from the tap, shake for 30 secs. then drain off the water. Works very well - my wife's iron no longer suffers from a crusty build up around the steam-holes. I use the water in my car batteries, one of which is now 9 y.o. and the other 4. Never had a problem. The cannisters sell for about $6.
Robert
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