Chlorine is added where a river is the source of drinking water as the catchment area may have creatures that spread giardia, but a simple carbon filter will remove it from drinking water, see an earlier post.

chlorine hwc damage

Christchurch plumbers and property managers are worried about the surge in failing hot water cylinders, and many blame the city’s chlorination regime.

The controversial chemical, which has been added to drinking water since March, may have led to leaks in pipes and cylinders, leaving landlords with a $2,000 replacement bill [that figure is conservative, we know from our own experience. — Eds].

A large number of plumbing faults have been reported by four separate property management firms, while one manufacturer says demand for new cylinders has doubled.

full article on the stuff website