Filtered water in glass
Research report
23 November 2018

Water filter jugs: Do they work?

Chilling should mask the flavour of chlorinated water, but another option is buying a water filter jug. We put three jugs to the test.

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Anthony W.
06 Oct 2020
Fluoride

Do you know of any water jugs that will remove the Fluoride from the water?
I see that the "MyWaterJug"from Waters.co claims to ... but can we believe that claim? Thank you.

Marg A.
09 Mar 2019
Brita Marella 2.4L

This jug can be bought at Mega Mitre 10 for the stated price, of $29. I have bought 2 of them as gifts.

Llyvonne B.
13 Dec 2018
Alternative to the small jugs

Stefani ( at bunnings) I think are a better option to the above water jugs. They have benchtop gravity filter and I have found them very good. They use a ceramic candle filter and the water flows through, similar to the jugs, with the advantage that they hold far more water than the jugs.

Mark J.
08 Dec 2018
Your misleading statment

I must have a better sense of taste and smell than you because I can taste (smell is slightly less) the chlorine in water that has been placed in the fridge. I tried a number of non scientific tests including leaving tap water in a bowl in the sun for up to two days and refrigerating it after different times. Aerating water reduces the amount of gas, but does not remove the salts. Which leave a taste

Maggie L.
29 Jun 2019
Chlorine doesn't have "salts"

Chlorine doesn't have a "salt" and after two days at room temp the water won't have any free chlorine in it.

I think perhaps you're experiencing a bit of cognitive priming. You expect the water to taste different so your brain gives taste reception higher priority causing you to notice differences in flavour that were probably already there but you hadn't noticed before. It's like those pictures where it could be a vase or two faces and you can't see both until it's pointed out to you. It was always there and once you 'see' it you always see it.

Anyway, the chlorine 'smell' people talk about isn't actually chlorine but a disinfectant by-product called chloramine (this is also what gives swimming pools that chemical smell).

Chloramine is formed when chlorine (as underchloric acid) reacts with the ammonia from decaying organic waste (and urine in swimming pools). These chloramines also disinfect the water but they don't evaporate like chlorine does. Perhaps this is what you're tasting but I would expect you'd smell it more acutely as it has a strong odour.

The whole chlorine process is really quite interesting. When added to water, chlorine forms underchloric acid - some of which, in turn, expires to hypochlorite ions. Because chlorine is diatomic these two forms of chlorine can bond and are measured as free chlorine in water. Free chlorine breaks apart when exposed to ultraviolet radiation from the sun, releasing the chlorine as gas into the atmosphere. Sunlight is so effective at reducing chlorine that a bright, sunny day can do so by 90 percent in just two hours.

Interestingly, it's the unstable nature and changing forms of chlorine that make it such an effective disinfectant. Depending on the pH of water, chlorine forms different ratios of neutral underchloric acid and the negatively charged hypochlorite ion. Underchloric acid is really good at penetrating the cell walls of pathogens where it comes into contact with the pathogen's enzymes. During this contact underchloric acid exchanges a hydrogen atom for a chlorine one thus causing the enzyme to malfunction and pathogen to die.

Michelle G.
08 Dec 2018
Does it affect the fluoridation level?

Are people with these jugs still getting the fluoride?

Consumer staff
10 Dec 2018
Re: Does it affect the fluoridation level?

Hi Michelle,

None of the jugs we tested claim to reduce fluoride levels so we didn’t test this.

Kind regards,

Belinda - Consumer NZ staff

Theresa C.
24 Nov 2018
Brita - price query

I'd query $29 for the Brita Marella 2.4L jug - are you sure it wasn't purchased for $39? If price stated is correct, can you let us know where from?

Consumer staff
26 Nov 2018
Re: Brita - price query

Hi Theresa,

You can buy the Brita Marella for $29 from The Warehouse: https://www.thewarehouse.co.nz/p/brita-jug-marella-2.4l-blue/R2385348.html#q=brita+marella&start=1

Cheers,

Natalie - Consumer NZ staff

Lorraine B.
24 Nov 2018
Replacement cartridges

I have a Brita filter jug which is fine. However it is an old model which does not have the correct size cartridges available. I bought some on line which look correct but they are just a little too small so let the water in around the sides rather than through. I had already decided to just fill the jug and not use the filters.

Kas S.
24 Nov 2018
Counter Top filters have changed

I brought one from a great NZ seller which has 2 different attachments depending on the tap. If it's an older tap there is a rubber suction type attachment that just pushes on or if newer there is a screw on attachment. Have used both with no problems.

Pieter M.
24 Nov 2018
Water filter jugs and pH

Just a question - what are the benefits of raising the pH of your drinking water?

Consumer staff
30 Nov 2018
Re: Water filter jugs and pH

Hi Pieter,

There are various health claims about alkaline water (which has a pH greater than 7). In our test of bottled water (report coming soon) some alkaline waters made claims on their websites, such as drinking high pH water can relieve or reduce premature aging, and detoxify your body.

Although there are a few studies that suggest it might be helpful for some conditions, like acid reflux, there isn’t enough evidence to support its use as a treatment for any health condition. And as far as detoxing goes, there’s no need to drink alkaline water to do this. Your body is continuously detoxing on its own (your gut and liver break down unwanted and potentially damaging compounds, which the kidneys eliminate.

Kind regards,

Natalie - Consumer NZ staff