I've been told that the calcium levels you describe are not necessarily the problem. I asked the same questions you have about a month ago and was told that calcium levels up to about 400 are manageable and will not cause scaling. I'm currently experimenting to see if I believe this.
I, too have these kinds of deposits on my pool. I'm told the problem arises from allowing Ph levels to creep up and go unchecked for a couple of days. My fill water is city water supply and is hard to keep below 8.0 for very long.
Your Ph seems good now, but does it run high? I'm currently watching my Ph levels much more closely and will focus on that for another month or so to see if that helps. Perhaps we could compare notes via this forum to see if this is the root of our calcium deposit problem.
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