Help with RO Water - II

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Peebee

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A second go at this 'cos I didn't gather any useful way forward from the first. Perhaps the resident RO Water guru (@Buckeye_Hydro) has my answers?

We (in UK) have a commercial outfit - "Spotless" - selling RO water for cleaning windows. They are proud to announce their RO equipment has a 99% rejection rate. Makes for easy calculation of water treatment salt additions! But you would not want that water in your copper pipes! (Or to drink as-is). Pipes with any metal for that matter. Water with no alkalinity will eat them for breakfast! But most here seem equally proud their water has zero minerals? RO water for drinking is "remineralised", but we don't hear much about that. You can see it in the Bru'n Water calculator (I've seen the same "Profile" in other calculators too):

1733755501977.png


The mineral salts present must be the result of post-filter "remineralisation". No vendor of RO devices is going to admit their membranes allow 16ppm (bicarbonate) through.

Comments please ...
 
[shrug] My RO output consistently ranges between 9 and 11 ppm (input water is typically ~250ppm and quite hard). That's essentially "zero" in the big picture but I distributed 10 points across that Bru'n Water section at the same ratios as my raw water test results. Probably not "accurate", but again, probably doesn't matter, either...

Cheers!
 
A second go at this 'cos I didn't gather any useful way forward from the first. Perhaps the resident RO Water guru (@Buckeye_Hydro) has my answers?

We (in UK) have a commercial outfit - "Spotless" - selling RO water for cleaning windows. They are proud to announce their RO equipment has a 99% rejection rate. Makes for easy calculation of water treatment salt additions! But you would not want that water in your copper pipes! (Or to drink as-is). Pipes with any metal for that matter. Water with no alkalinity will eat them for breakfast! But most here seem equally proud their water has zero minerals? RO water for drinking is "remineralised", but we don't hear much about that. You can see it in the Bru'n Water calculator (I've seen the same "Profile" in other calculators too):

View attachment 864123

The mineral salts present must be the result of post-filter "remineralisation". No vendor of RO devices is going to admit their membranes allow 16ppm (bicarbonate) through.

Comments please ...
Sorry, but its not clear to me what your question is!
 
Sorry, but its not clear to me what your question is!
"Remineralisation filters". Please tell me about them ... or rather, please tell everyone about them 'cos I'm not about to get RO Water (in N. Wales, like in the Scottish Highlands, there isn't much in the water ... apart from the odd drowned sheep). I know RO Units can have them (post RO filter, especially whole-house units) to manage the otherwise acidic water, but I know little in the way of detail, and I suspect many don't.

I'm particularly interested in how they modify alkalinity but intrigued by what else they might do (as standard).
 
The most common are simply calcite (calcium carbonate) - will add minerals as long as the pH is below 7.

There are many different remin cartridges on the market with all manner of components
 
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