I use Reverse Osmosis for all internal uses. Near as I can see the 'don't use RO' idea has more to do with sensors needing ions than because it doesn't make good coffee - I had it mentioned after one of my posts and couldn't find anything that actually proves pure water isn't good for coffee.
I had a portable RO unit to begin with - came with an extra membrane and lasted close to 4 years (I was single then) - and my under-sink one has been going great guns since I got it. Last I looked the ROI for the under-sink (which is easily removed and also simple to replace any of the 4 filters) was about 3c/litre. Figured that is a worthwhile investment in my good health.
And the coffee is superb...
I had a portable RO unit to begin with - came with an extra membrane and lasted close to 4 years (I was single then) - and my under-sink one has been going great guns since I got it. Last I looked the ROI for the under-sink (which is easily removed and also simple to replace any of the 4 filters) was about 3c/litre. Figured that is a worthwhile investment in my good health.
And the coffee is superb...

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