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Question about ro/di

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Question about ro/di

Post by Sparky on Mon 03 Jun 2013, 3:09 pm

Ok, so I purchased a used portable ro/di awhile back. Not knowing how old the filters were, I replaced all of them. They ended up costing more than the unit itself. Anyway, according to the filter system, it should produce 50 gpd of ro/di water. It actually only produces about 10 gpd. Another issue is the waste water production. It should produce 3-4 gallons of waste water for every gallon of ro/di. It actually produces (and this is just a guess) about 30 gallons of waste water per gallon of ro/di.
So, here’s the question...what in the world am I doing wrong? According to my TDS meter, my tap water tests out at 178 ppm, the waste water (which is I’m guessing the ro water) tests out at 45 ppm, and the ro/di water tests at 0-1 ppm.
I’m happy with the quality of the water produced, but not with the amount of ro/di vs. waste water.
Any suggestions?
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Re: Question about ro/di

Post by DonnieP on Mon 03 Jun 2013, 3:56 pm

Do you have a valve on the waste side to regulate the flow? My unit has a valve that lets me cut the waste water flow down to force water through the membrane, this way I can get a 4-1 on the output. If yours is self regulating without a valve then the membrane must be stopped up. One more thing to check is that the membrane is seated correctly in the housing, make sure it is pushed fully into the housing before screwing on the end cap. 1-30 ratio says something is bad wrong.
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Re: Question about ro/di

Post by bigeflashgordon on Mon 03 Jun 2013, 4:12 pm

You might want to make sure that the lines are connected right.. Sometimes they can be put in backwards. Do you know what your incoming pressure is? If its not at least 60 psi you're RO membrane won't filter correctly and you'll get a lot of discharge
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Re: Question about ro/di

Post by Sparky on Mon 03 Jun 2013, 4:25 pm

There is no waste valve to regulate the flow.
The lines are connected properly.
No idea how much pressure is going in...
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Re: Question about ro/di

Post by shhh on Mon 03 Jun 2013, 5:17 pm

Ya my main issue was waste water. And that was due to 25psi.
Got a booster and pressue gauge and been good ever since.

Prolly getting close to change out filers. Lol
I am thinking water pressure is the issue.
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Re: Question about ro/di

Post by DonnieP on Mon 03 Jun 2013, 6:56 pm

I would try the simple fix of adding a control valve to the waste water side. Lowes has the valves. Mine is setup this way and I can control how much waste to filtered I get. The pic below shows mine with the valve. install the valve and use a gallon or half gallon jug and a measure cup to adjust flow. adjust it so you are getting one cup filtered to four cups waste. This is the rate you should be getting, one gallon filtered to four gallons waste. one to four ratio. The pic below shows mine with the valve on waste side, if you slow down waste more is forced through the membrane unless you just have almost no water pressure.

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Re: Question about ro/di

Post by Sparky on Tue 04 Jun 2013, 5:50 pm

I put a control valve on the waste water side...and what do you know...it’s amazing how well it’s working now!!!
Thanks for all your help guys!!!
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Re: Question about ro/di

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