pH crashes
 

Um guys,

If you feel comfortable, could you post your general geographic areas?
The main supplier for the SF bay area in California just changed from
chlorine to chloramine, perhaps they changed more than just that.

Also utilities can change processes for weather reasons too, adding more
chemicals if their sources get too much "unfiltered" runoff, etc...

-Donald
--
"A positive attitude may not solve all your problems, but it will annoy
enough people to make it worth the effort." -Herm Albright