I got a water report from the city and it's like reading Chinese. It's my understanding that levels of carbonate 50-300 mg/l and levels of calcium 50-150 mg/l are acceptable but my water report lists "hardness" as 300 mg/l, 99% of which is calcium carbonate(CaCO3) and 1% magnesium. Is calcium carbonate the same thing as calcium? Another problem I have is Chloride is tested annually and ranges from 5-90, hardness is tested daily and ranges from 190-340. pH is 7.6-8.0. 300 was the hardness as of yesterday at the facility, but who knows whats in the pipes. Please explain like you're talking to your kid, I'm not at all familiar with chemistry Thank you all for help.