Help! My Ca is Out of Control

[mas985]

Mike,

Have you tested your fill water lately? I would check it before assuming it is from the plaster. If it is your fill water, a softner is about your only choice short of trucking in water.

[duraleigh]

The only thing I'd add is 625 looks like a pool store test. Regardless of who's test it is, I would verify those results before planning a course of action.

[cwstnsko]

Are you have some sort of problem with water clarity? 600 ish is pretty common for CH here in AZ. Most people don't run into any trouble until 900 or 1000. Fill water is about 250 here as well. You accumulate CH because it is in your fill water, but does not evaporate. I tend to keep my Alk a little closer to 80 when the Calcium is high. Other than that, I just enjoy my pool I've been trying to keep track of the CH level of the fill water on a seasonal basis. If I can find a season where the water has less calcium, I'll probably just plan for a yearly partial water change timed to the lowest CH levels of the year.
My pool is 2 years old, never had a water change, started at CH of about 400 with new pebble-sheen. It has crept up to about 600 in 2 years time. As stated above, stay clear of the cal-hypo.

[mphare]

No. In fact I believe the water is quite clear. I don't perceive any issues, I just want to be sure there isn't a problem with the CH that high.

I test using a Taylor 2005. Granted, this is my first year to test with the Taylor, so I may be off on my readings.

When I had the pool store test the water, they get a lower CH level. I believe it's because they stop dropping reagent as soon as the water turns purple (away from red), not until it stops changing color and into blue.

Thanks!