Well, that answers some ofmy questions. I will check the acidity of my water from my osmosis unit and get back on that one.
One of the reasons i chose the osmosis unit was for it's ability to remove minerals. The bottled water here is high in calcium and having suffered from kidney stones In the past I wanted to avoid suffering again.
As for wasted water all our grey waste including the osmosis waste goes into irrigating our citrus trees so no waste there.
I will point out that the question as to Pip having an interest in selling these units hasn't been answered. I appreciate that people advertisng on the forum are also members but declaring an interest would only be fair.

However I do concur that an osmosis unit would not be ideal for someone parttime here. I would also like to disagree with the suggested high maintenance needs of an osmosis unit. The filters don't  need changing that often and they can be bought a lot cheaper in the uk than here.
Bruixot.