Quote Originally Posted by aquarium
How is that done?
Unfortunately if the CH isn't already low then the only way to lower it would be a drain and refill. If the fill water is high in CH (we don't know that; we only know it's high in alkalinity), then there isn't a good solution. So you are right that I really need to know not only what the current CH is in the pool but also what the CH is in the fill water. My hope is that the CH in both are already low (which would explain why there's no scaling nor cloudiness).

If the fill water is high in CH, then it's an extra bad situation because any filling after evaporation will introduce even more calcium in the pool. Let's see what the numbers are for CH before panicking. I'm also very interested because there appears to be no evidence of scaling nor cloudiness in this situation so this could give an even higher "limit" to the saturation index for a real-world pool.

Richard