This idea has been around for afew years, and has sadly not arrived in australia ( to my knowledge) in the marketplace. Maybe you could import one. There are complete units available in Japan, this item is just a lid that you add. There could be an issue with soap scum buildup in your cistern, I would recommend regular hot flushes to clear off any soapy buildup.
cooltools
apparently costs $89 in the US at real goods
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