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Old 11-13-2009, 10:18 AM   #1
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The importance of RO/DI water

Here's a little experience I had yesterday that may give some people who are on the fence about RO/DI units a little bit of a push.

I bought a 50 gallon-per-day unit and have had it attached to the sink in the back hall for about two months. Needless to say, my wife wasn't too happy about always having it there.

Yesterday I moved it to the garage and attached it to the wall near the door to the back hallway. The connection goes to the faucet in the garage.

My DI resin was about 20% orange when I hooked it up. I had topped up the tank with about 4 liters of RO/DI water and went to fill up the bottles I used. After four liters of RO/DI water from the tap in the garage my DI resin is now completely orange!

God only knows what was residing in that tube. It's the same house, the same water system.....just a different tap and pipe. If I had of put that straight into the tank and just added salt and a dechlorinator I would have likely killed everything in it.

Now I need to pickup a new DI filter and will be running that tap for a while when I get home to hopefully clean it out a bit. Not all water is created equal
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Old 11-13-2009, 04:13 PM   #2
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... Or it could just mean that your RO membrane isn't working right after the move and your DI is doing 100% of the work.
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Old 11-13-2009, 05:19 PM   #3
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There's no way to botch it up. The whole unit is mounted to a metal bracket. moved the whole assemby to two screws on the wall. Connect the input to the water faucet....red tube is RO and blue is RO/DI.

The only difference was location and where the water was drawn from. That tap hadn't even been turned on since the the beginning of September.
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Old 11-13-2009, 05:31 PM   #4
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There's no way to botch it up. The whole unit is mounted to a metal bracket. moved the whole assemby to two screws on the wall. Connect the input to the water faucet....red tube is RO and blue is RO/DI.

The only difference was location and where the water was drawn from. That tap hadn't even been turned on since the the beginning of September.
So it's not possible for something that was in the stagnant water to foul the membrane itself? OK.
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Old 11-13-2009, 06:03 PM   #5
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That's exactly what I said. A different tap that hadn't been used for a long time had enough built up in it to finish 75% of my di filter making only 4 liters
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Old 11-13-2009, 06:41 PM   #6
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Hmmm... not sure how else to put it. I'm not arguing that the water was nasty, but am debating what really caused what to happen.

Let's just say that I'd keep an eye on the rate of depletion of your DI resin. If it stays high, then take a look at your membrane - you might have issues.
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Old 11-13-2009, 07:07 PM   #7
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Jaybird,
You didn't say if you flushed the line before you hooked up the unit?

P.S. is your water from a well, municipal or other source?
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Old 11-13-2009, 07:28 PM   #8
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Nope, I didn't flush it first. I'm on municipal water. Because I didn't flush the line it killed my DI filter.

That's the point of the warning. I didn't think to flush it before hooking up the RO/DI system. If I had of just run that into a container, added salt, and put that in the tank it would have been exactly like that movie 2012....explosions and all !

I'm going to order two new DI filters for the system.
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Old 11-13-2009, 07:47 PM   #9
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It's not the water. It's possible the line had alot of sediment in it when you hooked up your unit.
Then you hooked up and sucked all the "stuff" into your unit with the water.
Depending on the make up of your pipes, (copper, brass, plastic, or steel), they will all collect debris and scale differently based on their age.
Flush your pipes but more importantly you want to flush the main line into the house off the street main.
Do that by opening all the faucets, hose bibbs, etc. you can. Run them for 4-5 minutes.
You basically want the velocity of the water in the pipe to exceed 10 ft/sec of flow. At that rate all debris in the pipe will be pulled out.
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Old 11-13-2009, 07:51 PM   #10
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it would have been exactly like that movie 2012....explosions and all !
Nice...
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