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Old 01-09-2005, 07:18 PM   #1
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RO Question: Good vs. Waste Water

Hi all. I hooked up my new RO unit today and am putting it through it's paces (Checking for leaks, flushing everything out). I let it run for a while and collected the good and waste water in identical containers. I found that I'm running about 2.5 times more waste water than good. Is that normal? Is there anything I can do to make that a little better in favor of good water? I'm on city water and my pressure seems to be very good. I don't have a pressure gauge to know the PSI, but it seems to be very good water pressure.

Thanks for the help!

Jeff
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Old 01-09-2005, 08:04 PM   #2
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Your ratio is about right and if you figure out a way not to waste water let us all know, lol
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Old 01-09-2005, 09:42 PM   #3
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Thanks for the input. I got a little scared when I read somebody's post that said they were getting 5:1. It seems that that is not the norm though.
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Old 01-10-2005, 12:12 AM   #4
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normal is about 4-1. I run the waste water line into my washing machine.
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Old 01-10-2005, 10:57 AM   #5
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I worked on my RO/DI unit this weekend and something occurred to me. I have a 6 stage unit and the waste water doesn't come out until it's been through 4 stages....sediment..precarbon...carbon and then I forget the 4th stage. My issue with my own water is nitrates...howver I collected both waste and 6 stage clean water and they both tested for zero nitrates. Is it possible that I could use both the waste and "pure" water since the waste water does collect at a much faster pace?
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Old 01-10-2005, 11:26 AM   #6
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Membrane is the 4th stage for me....so the only things the water is not going through that I can tell is the DI and the polishing stages...any advice
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Old 01-10-2005, 12:06 PM   #7
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The DI stage removes phosphates and silicates. If your tap water contained NO3, I would bet it will also have PO4 and silicates, only way to be sure is test after the RO stage. I would use the water after the DI for the tank otherwise.

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Old 01-10-2005, 02:30 PM   #8
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Quote:
I run the waste water line into my washing machine.
As in you have the RO drain line straight into your wash machine or you fill a seperate bucket and dump it into the wash machine?
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Old 01-10-2005, 04:28 PM   #9
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right into the wash machine. I have a T-installed so when it gets full I can sebnd the waste water down the drain while the clothes wash.
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Old 01-11-2005, 10:35 AM   #10
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So on Sunday I started filling a 33 gallon trashcan with both "waste" and RO/DI water. I mixed salt and let it sit...since the temp out of the tap has to be cold.....got home last night and tested for PO4...came out with a .25 reading...if that. It was kind of hard to tell. Is that a good reading...obviously a 0 reading would be better but is that even possible with PO4?
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