This is exactly how it's done. The chemical will seperate them for you.When you add sodium hydroxide the anion floats, and you tip it out into another jug. The cation stays in the first jug, as it doesn't float, thus;
I always thought that a "mixed bed" is better to polish water. Correct me if I'm wrong.
I don't understand the problem. If TDS is zero out of the anion stage you have great water. When did you last change the RO membrane? Eliminating the RO membrane is not a good idea. How good or bad is your soucre water? What does it contain?
I did not mix them. I ordered it off of Amazon before I learned today that they came sepererate. Or I would have done it that way. ( see downloaded picture from earlier.
Which do you put first?
Number 21
Could you point out how cross contamination could happen? That is the watts system
The original post asked the question why the tds was higher after the cation stage, I received the answer and am satisfied.
All the water is treated straight from the cold. It goes through the sediment filter then the carbon then to the pump. I have no idea if the water can flow in reverse back through the pump . If it can then yes I can see contamination if there is a pressure drop in the town supply.There are differences with the way my system is piped if you will. I do not use an expansion tank that is used in conjunction with a drinking water faucet. Also not clearly marked is a check valve before it goes into the hot line and cannot backwash through the system. So I fail to understand the ex sales persons statement of " flushing the membrane " which cannot be done unless as I said the water can backlog through the pump. Sorry for the prejudice about the lady who wrote the article but the heating and cooling company I worked for is run by salespeople who mostly lie to people. She says that an old system is less efficient. How is that even possible when it is all canisters with cartridges we change? Anyway. So the final thing I failed to mention is the " tank " line continues to my DI filter then into my container. The other is pinched off so no flow or pressure build up. FInnally I have shut off valves on the cold outlet and the hot into the hot line and both are shut off when I am done and the booster pump is unplugged so it is isolated completely. So what should have been " waste " water in some systems due to what she called the flushing of the membrane does not take place. The water that goes back into the hot line is treated water in my case. As a point of interest which I wished I still had a picture of the sediment filter but it was on my computer that crashed turns from white to a completely disgusting black. Hope that makes sense to you let me know if you think I am missing something. It would not be the first time. I am trying to be as ecologically friendly as I can. I used to subscribe to a Canadain publication called harrowsmith. Back in the early 80s. I did what you would refer to as a thesis on a much smaller scale of course in one of my trades on solar which was in its infancy? Not very efficient but interesting to me. Still have a book on energy efficient homes.
Yes sorry for taking over but I thought you wanted to save water as well which is why I mentioned what I use
I did not realize that and can totally understand what you are saying. How does bacteria grow I don't understand that but not arguing. I can imagine many scenarios in that case. Luckily for me as I explained I do not use my system for drinking water so that wont happen. My last post states the only way it could happen in my case and involves it being used which it isnt when I am done making my water and a power outage and the town water supply loosing pressure all at the same timeAs to your mixing valve situation I spent hours trying to explain that to customers because their hot water was tempered down . They rarely believed you but if the plumbing was exposed I could prove it. Thank you for your time and patience
