I agree with Carl. Hard water doesn't suds as well and in fact having the CH raised to around 120 ppm is a way of reducing foaming in spas and vinyl pools. In a plaster pool, the CH is already high enough.
Another technique that works in spas is to aerate the water to force more suds, then skim them off the top of the water.
I doubt that enough was added for sudsing to be that much. I just mentioned it as a possible side effect.
Richard
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