This is actually the first time we have noticed staining. Our water around here is normally clean/stable, except supposedly a lot of calcium-(something).

We don't normally add much, and maintenance is usually not too complicated.
The past years all we had to do was add chlorine tablets and shock every other week (didn't even have to bother checking levels, they were always okay). Maybe the ITS "Chlorine-Free" shock is causing the stains, that we use in rotation with ITS "super shock"? I think someone else also used some kind of phosphorous removing chemical and "solar pill".

I'm in the process of convincing the other guy to switch to the BBB method, and testing for hardness/stabilizer.

I've got a liquid test kit, but doesn't have calcium/stabilizer tests. I'll try to get the K2006 ASAP.


Just realized posting my IP address publicly is a bad idea. Can you edit it out in my original post?