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Besides chlorine and high TDS there are some other inorganics that could maybe build up.

Inorganic Substances
___________Unit____ Calgary Water_________ Limit
Aluminum -----mg/L ------0.013 - 0.214 -----------0.1
Arsenic -------mg/L ------< 0.0005 ---------------< 0.025
Cadmium ------mg/L ------< 0.0005 ---------------< 0.005
Calcium -------mg/L -------39.8 - 69.9 ------------no limit
Chromium -----mg/L ------< 0.0005 - 0.0016 -------0.05
Copper --------mg/L ------< 0.001 - 0.003 -------< 1.0
Fluoride -------mg/L --------0.62 - 0.80 ------------1.5
Iron -----------mg/L ------< 0.100 ---------------< 0.3
Lead ----------mg/L ------< 0.0005 ----------------0.01
Magnesium ----mg/L --------10.6-18.1 -----------no limit
Mercury -------mg/L ------< 0.00002 --------------0.001
Nickel ---------mg/L -----< 0.0005 - 0.0011 ------no limit
Potassium -----mg/L -------0.461 - 1.636 --------no limit
Sodium --------mg/L -------2.24 - 7.84 ---------< 200
Zinc -----------mg/L -----< 0.001 - 0.003 -------< 5.0

Sorry for my crappy table.