Seen a couple of threads about water filtration systems.  Might be of interest to those tossing up the idea.  

https://www.stuff.co.nz/business/105015268/hrv-pleads-guilty-over-false-and-misleading-watersoftening-claims

Water filter company HRV has pleaded guilty to 11 charges laid by the Commerce Commission related to false and misleading claims about the benefits of its filters and the quality of New Zealand's water supply.

Charges were laid in Auckland District Court on Monday under the Fair Trading Act, and related to claims HRV made between July 2014 and October 2017 on its website and through promotional content.

The commission said HRV's claims about its filters' water-softening properties and ability to reduce skin conditions such as eczema and dermatitis were unfounded.

HRV also misled consumers about the levels of chemicals and additives in New Zealand's domestic water supply, and the need for consumers to buy a water filter to address this.