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Is Reverse Osmosis Wasteful?

by Mark Timmons May 10, 2011 70 Comments

"Don't even talk to me about reverse osmosis" said the woman on the telephone. "They waste too much water and I want to be conservative with our water resources!"

That is something I hear quite frequently and frankly, I don't understand it. Oh, I understand wanting to be conservative with our natural resources, but that same woman was driving 7 miles to town and back to get bottled water which probably was made by reverse osmosis anyway! Let's pollute the air and waste fossil fuel, but dad-gumitt, I won't waste a drop of precious water! Of course that is crazy, but let me put this in perspective. A reverse osmosis system wastes about 4 gallons of water per gallon made. If you use 3 gallons a day for drinking, cooking and internal consumption, that means you will waste about 12 gallons, making a reverse osmosis system about 25% effecient! However, US Water Systems are able to reduce water waste by up to 80%

Is that bad? Like I said, let me put it in perspective. Do you have a washing machine? Do you have a dishwasher? Why do you have a washing machine and dishwasher? Well, obviously it's to get your clothes clean and to get your dishes clean and sterilized. How efficient is your washing machine? A reverse osmosis system is 25% efficient. A washing machine and dishwasher uses electricity and hot water (which takes energy to heat) and WASTES EVERY GALLON OF WATER THEY USE.

A reverse osmosis system is not nearly that wasteful - no electricity and no wasted energy with heated water. You have a washing machine to get your clothes clean. You have a dishwasher to get your dishes clean. You think nothing of wasting water and energy to get your clothes and dishes clean, and yet you don't want a reverse osmosis system that is 25% efficient to get your water clean? Are you nuts? How long can you live without clean clothes? You might stink, but it won't kill you! How long can you live without clean dishes? You get the picture? Your body uses water to cool it and eliminate waste, but you are unwilling to waste a little water to clean your water for internal consumption? The water you drink sustains your life? You'll waste water to clean your clothes and dishes, but not to clean your water? You must be kidding!

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70 Comments

March 06, 2018 Mark Timmons

Well, that is not the logic. The logic is that water used for drinking is vitally important, and if you use water to wash your clothes and dishes, why in the world would you be opposed wasting a little water to support your life? That said, there are ways to minimize the waste and we encourage that!

March 12, 2018 Mj

I support the argument about volume of water used. There’s precious little logic in thinking about your or my usage when our country alone has millions of users. Tell us any NEW ideas you have for water conservation.

March 12, 2018 Mark Timmons

I specialize in water treatment, but I do try and balance conservation whenever possible. OK, I’ll give you a NEW idea on water conservation: Why do some people lose their freaking minds over wasting a couple of gallons of water a day in order to purify their drinking water to maintain their health and think nothing of running their dishwashers just to keep their dishes clean? There are other ways to clean your dishes other than with water in a dishwasher, but for many contaminants there is no better method to purify water than reverse osmosis? Myself and many others value their health higher than their dishes.

March 14, 2018 eric jones

this needs to be taken offline. a url of uswatersystems telling people its a good idea to dump 3 gallons in the septic for a glass of water is unacceptable. im having trouble finding words to describe how bad this is. as a few have said clean water is an undeniable requirement for mankind to continue as a life form and we already have about 7 billion people more then are planet seems to comfortably support. This artical makes it appear as the us supports wasting water, go to northern California and tell the farmers you having fancy pants drinking water is more important then civilisation continuing, as they are individuals already struggling from drought i expect you will get a nice quick educational exorsice, including one hell of an ass woopin. the example showing all drinking water being ro in one city will take the water needed to feed millions of people should q you in to the severity of this issue and how a single artical online that seems offical from its source page could in fact cause as much suffering as a country going to war. war over water is already a part of are world…..its endless. if some sales man told me some shit like this i would lose my shit. right there in public with the goal of it being as publicly witnessed as possible, and i hate being noticed in public litterly run from cameras.

March 14, 2018 Mark Timmons

Eric,

You need to get a grip on reality. Who said you have to waste 3 gallons of water for 1 glass? That is unacceptable and it is also fiction. Efficient RO systems make 4 gallons for every gallon wasted and the waste can be reused, so come on back to reality. Don’t make stuff up and don’t put words in my mouth. It doesn’t make you look smart.

March 23, 2018 Ron Smith

This is ridiculous. These “experts” are using ridiculous arguments for wasting water. So, we are supposed to add yet another way to waste water, besides the dishwasher and the washing machine? That’s not a reasoned argument at all. Reverse osmosis should he illegal.

March 23, 2018 Mark Timmons

Ron,

Why are you so fixated on this? Do you wear jeans? Do you know that to make a pair of jeansd up to 1,800 gallonsd of water are wasted? You better go naked, dude or you are a hypocrite!

Do you drink milk? It takes up to 2,000 gallons of water to make a gallon of white milk! A loaf of bread requires about 240 gallons of water, and a pound of cheese takes about 382 gallons. So a simple cheese sandwich takes about 56 gallons of water. Throw in a small bag of potato chips at 12 gallons and you just ate about 68 gallons of water. Add some turkey and it jumps to 160 gallons!

The only argument lacking reason is yours! Give it a rest. You have no argument.

March 23, 2018 Ron Smith

It’s 3 gallons of water wasted for every gallon used and depending on how you use it, it can be far worse than that.

March 29, 2018 Mark Timmons

Ron,

The amount of waste depends upon the system. Some are 3-1, but we have systems that waste 1 gallon for every 4 gallons made.

April 01, 2018 Mike

I too originally thought that the tone was a little flippant, but reading through these comments I get the point. Yes there is some waste, but there are ways to use the leftover and in comparison it does seem worth it. I drive a hyrbid and conserve when I can. I too thought about getting 5 gallon jugs of water while I was at store shopping , but it doesn’t seem to make sense. So I load 4 -5 gallon jugs drive home and feel like hooray I’m getting clean water and not harming environment. But if I do that couple times a month I have used more MPG carrying that load and adding to landfill. Also as mentioned if that water I’m so happy buying or refilling jugs was made from RO in the first place I’m really not helping. I think point he is making is we wash our cars in the car wash without a second thought, or some brush their teeth with water running, or taking longer showers or running water while shaving, or leaky toilet, faucet or a myriad of other ways we waste water with 0 actual benefit. In that case drinking water that is going into my body, an actual good case makes no sense to balk at, considering. I’m sure some will disagree and then go water their lawn to keep it bright green etc etc, but if nobody has a better idea or alternatives not really a point in attacking the author.

May 19, 2018 Mark Timmons

Thanks Mike,

We are always trying to conserve water, but some people just lose their minds over nothing, so I just give it back to them.

May 19, 2018 JB

I really just wondered what the ratio was because I didn’t believe it was as high as I was told (turns out it’s higher).

We took out the RO and replaced it with an eSpring, since it uses 100% of the water, has UV technology, and has a higher clean water rating than the RO.

May 20, 2018 Mark Timmons

How do you like the warm water? How much do you have to run until it cools down? UV consumes energy too and over time, the fittings become embrittled from the heat. Watch for leaks.

Since RO removes a much larger spectrum of contaminants than any other process, there’s no way filtration can have a higher clean water rating. It’s scientifically impossible!

May 26, 2018 JB

It’s not warm… so I’m not sure what you’re referencing. I saw online that older models had the light on all the time so that may have made warm water?

August 24, 2018 Steve

The point many are missing related to the scenario of traveling to purchase RO water is that the “store bought” RO water ALSO required 4 gallons of “waste water” to make each clean gallon. The woman in the hypothetical scenario isn’t saving any water at all.

It’s a choice of personal preference; I can’t imagine not having a system here in the AZ desert, even with the extreme need to conserve. We rely on our RO system to provide clean, safe water for consumption, ice production, and use it in the humidifiers as well. We currently divert much of the “waste” water to our landscaping, ant the native plants seem to thrive on it.

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