Perchlorates already contain water. Atmospheric water
sublimates off into outer space or ends up at poles as ice.
They stop all the water going away or all ending up at the poles.
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On Wednesday, October 7, 2015 at 6:35:41 PM UTC+1, Tony Lance wrote:
Chart shows Chrystaline form of water solution locked into perchlorates.

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On Wednesday, 7 October 2015 18:34:25 UTC+1, Tony Lance wrote:
It does not look like flowing water to me, more like seepage.

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On Wednesday, 7 October 2015 18:33:25 UTC+1, Tony Lance wrote:
The temperature range of liquid water on Earth is 100 degrees.

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On Wednesday, 7 October 2015 18:32:19 UTC+1, Tony Lance wrote:
The Saline Slopes of Mars