I would speculate that dry perchlorates in dust clouds soak
up some atmospheric water and dry rain falls to the ground.
In the beginning and end of each day the perchlorate enters
a dew phase and passes from ice to liquid to chrystaline
to liquid and to ice. In summer some water is liberated from
the pole. That would describe a complete water cycle.
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On Thursday, October 8, 2015 at 5:57:30 PM UTC+1, Tony Lance wrote:
Perchlorates already contain water. Atmospheric water

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On Wednesday, October 7, 2015 at 6:45:14 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 18:44:18 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 18:43:26 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 18:42:31 UTC+1, Tony Lance wrote:
The Saline Slopes of Mars