I am now using soft water for my pool. Our muni water here in Chandler is about 200ppm of hardness and my soft water is 25ppm.
I have a PebbleTec pool and have seen no negative effects.
However, I have not seen an increase at all in my calcium hardness since switching over to soft water.
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Right now I am using a hose since switching over to soft water. However, very soon I will re-plumb my autofill to a 3-way valve. That way I can either select city hard water or my soft water depending on the situation.