Culator -- Solution or Just Another "Pool Store" Product?

[JimK]

The higher calcium is for fiberglass pools. There is some empirical evidence that it helps lessen iron staining and cobalt spotting which fiberglass pools are prone to more so than other pool surfaces.

I very much doubt that the calcium is directly preventing staining.

I suspect that what is happening is that you are creating fine calcium precipitates in the filter, which because of flow and surface area tend to get 'stained' BEFORE the pool does.

If my analysis is correct, this is directly related to the method I've mentioned of using cal hypo to remove metals from the water.

Thanks.