There are plenty of things which are better to drink than distilled water, says John Riddell. But then, most of you probably knew that anyway.
Eight is Enough
Unless you have been tied up in a cave for a few years you will have heard the adverts for water distillation units. These ads are a good example of how you can mislead people with a number of true statements. “It is a proven health fact” we are told, “that we each need up to eight glasses of water a day.” Which, strictly speaking, would mean that drinking more than eight glasses a day could be bad for you. Toxic stuff that dihydrogen monoxide. Although, strictly speaking, it isn’t true. If you have been eating nothing but dog biscuits in Egypt in summertime, you might need more than eight glasses, but as a general rule, eight is enough. The strange thing is not that too much water can be bad for you. The strange thing is that when many people hear this ad, they mistakenly think it is saying we should all drink eight glasses of water a day. It is probably true that, in our climate, the mythical average man needs about 1600 ml of water per day. About eight glasses. But food contains lots of water. Watermelon, mashed potato, peas and even steak all have heaps of water. So do tea, coffee, milk and orange juice. And don’t forget beer. On top of all this, eight glasses is probably too much.
And then the ad goes on to say, “So how can we be sure that the water we drink is pure?” You have to ask, “Hold on, who said it had to be pure?” I actually like my orange juice to contain water. In fact I find it really dusty if it doesn’t.
Put a litre of freshly squeezed organically grown orange juice into a water distiller and turn the machine on. You will end up with nearly a litre of water to drink, and some yucky goo at the bottom of the evaporation chamber. This could then be used in an advert to show the evil contaminants that would have ended up inside you if you hadn’t distilled it first.
Don’t get me wrong. Distillation is wonderful. Some of my favourite things are the product of distillation. And the water distillers made by this company, while more expensive than the ones at the Home Brew shop, are very well made and more suited for the production of drinking water than stills designed for producing vodka.
The problem I have is that distillation is a very expensive way of getting drinking water. Okay, it is cheaper than buying mineral water, but then so is lemonade.
They go on to list the things that distillation can remove from water. But they don’t list the things it doesn’t remove. Ethanol, methanol, propanol, carbon tetrachloride, petrol and diesel, to name a few. Put a teaspoon of petrol into your distiller and tell me what the water tastes like. The things that distillation does remove are either not in tap water, or not harmful, or not there in large enough quantities to be harmful.
For example, it is true that distillation removes “the evil Giardia” but the one time Giardia got into a city water supply it was international news. Everyone in Sydney knew they had to boil the water for a while. Since Giardia is only slightly more likely than elephants to be in the water supply, routine distillation of the water seems a bit excessive.
There are three main reasons why you might want to distil your water. Health, safety, and taste. For the sake of your health, being dehydrated is bad. If you don’t drink enough water, you will die. No question. Even being a little bit dehydrated is bad. And if you drink too much, you can also die. But the water doesn’t have to be pure. Tap water is just as good at rehydrating as distilled water. But when a baby’s life is in danger because of dehydration due to diarrhoea, doctors add salts to the water. Giving the baby pure water can be fatal. Pure water isn’t necessary for good health. Sometimes it is dangerous.
Does water need to be pure to be safe? Of course not. Distillation does remove bacteria, but so does boiling or chlorination. Most of us live in cities or towns where the local council has a water treatment system. They very economically remove everything from bacteria to elephants and sediments, and they make the water safe to drink. Distilling town water to make it safe is simply a waste of money.
That leaves us with taste. I went to Alexandra Park to watch the trots one time, and foolishly bought a cup of coffee. I couldn’t drink it. I took one sip and threw the rest away. I can’t be sure but I think it was just the taste of the treated water that made it undrinkable. Town water. I live in the country and get water from a well. It tastes like water should. I could bottle it and sell it as mineral water. It has a few calcium and magnesium carbonates in it. That’s the mineral bit. We boil it for drinking, in case a cow stands too close to the well, but that’s all. And so when I get to taste town water occasionally, I sometimes don’t like it. But there are plenty of under the bench filtration systems( or on top if you prefer) which are cheaper to set up and cheaper to run, than the cheapest distillation system. Putting a new filter cartridge in every month is much cheaper than using a still.
Another thing that is interesting about that advert. They say something like “Some of our customers believe they have had the following health benefits from using the distiller.”
And then they give a list of things that could be explained by the placebo effect. What they don’t do is give a list of scientific articles published in peer reviewed journals on the health benefits of using distilled water.
The advertisers aren’t silly enough to say drinking distilled water actually cures these ailments. They know that would be a false claim. But it is true that some of their customers have fooled themselves into thinking that drinking distilled water has been good for them. And so by repeating the customer’s false beliefs, they can create the impression that there is good evidence that distilled water is good for you.
“It could”, they say, “be the healthiest investment you ever make.” Or it could be a complete waste of money.
John Riddell does in fact have a distillation plant at home, but doesn’t use it for water.