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Old 08-06-2010, 07:41 AM   #11
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RO filters remove salt from the water. Desalination plants use RO filters to make freshwater from seawater. He may have a couple filter canisters in his sump, but if it's an RO unit, he's turning his saltwater into freshwater.

The Pros and Cons of Reverse Osmosis Desalination
"RO technology is pretty easy to understand, with plant designs consisting of pipeline and filtration sections.
The pipeline draws saline water from a local into a filtration plant. The plant consists of a series of smaller pipes filled with RO membranes. As the water moves through the RO membranes, they catch salt and other organic and inorganic materials considered unhealthy in drinking water."

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Old 08-06-2010, 12:08 PM   #12
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My 5 stage removes salt of moderate concentrations, also. Good point about the membranes though. I guess if the sump has adequate sediment filtration so as to prevent larger particles entering the membranes it should be ok.

TBH, I think that the output of an RO/DI correlates to the quality of the input. I.e. filtering dirty water will be less effective as filtering moderately clean water.

He is most definitely turning his saltwater into freshwater, and then increasing salinity thereafter as required. lol I shall ask him all of these questions next time I seem him for sure. He lives in Wellington, New Zealand. I only visit him once a year when I vacate!

Has anyone tested the difference in quality? Fresh water vs. tank water?

It sure is an interesting concept! lol

The Codfather !

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ro/di, sump

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