Dinsdale wrote:
Thanx for the heads up KK. Will definitely keep that one in mind. I had no idea that the water could be too pure.
My interest being piqued, today I had an in depth look at the insides (not into the boilers) of MY machine. Bear in mind that what I'm going to say is specifically about MY machine (Profitec Pro 700) but will most certainly pertain also to quite a few others. Check yours for the same or similar mechanisms. My water level tx is simply a magnet fixed to a float in the water near a garden variety hall effect sensor in the machine. Hard to tell exactly what the temp txs are, but my bet (90+%) is thermocouples - cheap(ish) and very accurate. The pressure gauges are simple, garden variety bourdon tubes. So, for MY particular machine, ultra-clean r/o filtered water will be fine for life. In fact will be best. However, what KK said (above) would very definitely hold true if you own a Breville BES900 for instance. I've emphasized MY machine because it's not necessarily going to be true for yours. I'm not wishing to undermine KK's advice (above), just letting you know that some are different. If you have no way of finding out about your machine then follow KK's advice. It'd work fine on my machine too. I have the advantage of being an Avionics Technician and a Scientific Instrument Maker and Repairer.
