call for water report
Your water company will be able to tell you the details of the tap water. Call them. It is really important.
Ask for the report that tells you
chlorine or chloramine
It may also tell you calcium, magnesium, TDS, conductivity, certain metals like arsenic, lead, copper, and bacteria levels.
Nice to get that and keep it in a file, I guarantee you will pull it out within the year...."oh, maybe I have a calcuim or magnesium deficenciy.... Oh, those levels are on that report I filed!"
and while you are ordering parts for the CO2, go on and get an Aquarium Pharmacutical Master Test kit that has pH, ammonia, nitrite, and nitrate and a KH kit. Do not start CO2 without a KH test kit.