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This is the first year after startup in the 15 years my pool has existed that I’ve needed to add calcium to balance its chemistry. Wow, that was a wet winter in Northern California. Not complaining, mind you.

I have recently observed a phenomenon in my pool that leads me to propose the following hypothesis: SWCG scaling is caused by relatively high TA levels, whether or not the pool's chemistry is in balance. My pool is three years old. For the first two years I experienced the commonly reported...