New to the forum, but I have been reading most of the basics, and trying to come up to speed.
I am seeing a strange dark stain at various parts of my pebble-tec pool. Thought it was black algae, but after looking at posts ont his forum, I thought that this was probably not the same thing. However, I was already taking steps to combat black algae, so I am in the midst of shocking the pool and scrubbing the dark areas. I saw pictures of calcium scaling and thought that might be what is actually going on.
Here is a picture:
[attachment=0:3j2exj10]Pool staining 2.gif[/attachment:3j2exj10]
Did measurements on the pool using the TF100.
CH: 1100 (Wow!)
I didn't do measure the CH until today (after shocking for 3 days), after reading about the scaling.
So any ideas? Is this scaling? Everything else looks good on the pool except for this dark discoloration (or is it bleaching of the other areas).
Thanks for any help.