Flairform.com points out the following:
Instead of using your regular water supply you may need to find an alternate source such as rain or bore water, or treat your regular supply using methods such as reverse osmosis.
Common problems include:
- Total dissolved salts (salinity)
- Carbon dioxide
- Precipitates due to hardness salts
- Slimes & algae
*Braun, Charles L.; Sergei N. Smirnov (1993). "Why is water blue?". J. Chem. Educ. 70 (8): 612