We currently dose PAC at the water plant and was just curious about something.

We get our water from a river source and the water temperature changes constantly.  Does the dissolved aluminum residual change with water temperature?  Some people say in the winter if we have a large aluminum residual we are overdosing and in the summer if we have a large residual we are under dosing.

So I was just curious if this is true or not.

Thanks.

Solubility of all salts tends to increase with increasing temperature, but obviously saturation & supersaturation will eventually be reached.