This is why i dont like to use water from the tap, in my discus fish keeping dsys we would use a hma filter bare minimum, it wasnt unheard of people doing water changes, just using dechlorinator to find their fish belly up because the local water company had been doing pipe works and put a chemical flush through, safe for drinking but not for fish.
This is why i now use my rodi system for my water.
When we spend so much on machines, grinders and beans water needs to be up there too.