RODI not doing what it's supposed to!

[neoh]

I got a ro/di 4 stage off a member here, with a tds meter. I hooked everything up (completely blind - never done this before) and everything seems to be fine - except the fact that my out tds is showing 350ppm.

So, I figured I had the waste water/good water lines reversed - changed them around, and I still have the same TDS readings.

Every line I change around, my tds readings are still high.

Am I missing something here? It's not rocket science.

[RumRunner]

In mine waste water and good water is opposite the pic

[RumRunner]

or not wtf do I know

[scherzo]

Is that last filter on the bottom right a DI filter? If so, it should be last.

The water flow should be

1) sediment
2) carbon
3) RO membrane
4) DI

Here is a video explaining it.

http://youtu.be/Y0OeFInDFMk

[11purewater]

Originally Posted by scherzo

Is that last filter on the bottom right a DI filter? If so, it should be last.

The water flow should be

1) sediment
2) carbon
3) RO membrane
4) DI

Here is a video explaining it.

http://youtu.be/Y0OeFInDFMk

+1 looks like you're running DI into the membrane(still doesn't explain 300 tds)

[Evilweevil]

I had this exact problem with mine and after some tinkering I bought a brand new vertex rodi unit fixed the problem

[Ryanerickson]

I had a issue like this it ended up I had had di balls that was exhausted in my last pre filter but I figured it out by putting the line coming from tap directly into the ro then tested water that came out it was 0. What is the problem with di balls before ro? Will it make the life of my ro membrane shorter? I thought it would help it last longer because water coming out of pre filter is coming out at 1 ppm then it goes into ro any one know ? Thanks

[11purewater]

The DI is there to filter the Ro product water to 0 TDS(non conductive) if you can't achieve it with the RO membrane alone.For example 200 TDS feed water going through a membrane @ 98% rejection=4PPM product water,DI after brings it to Zero.

[scherzo]

Also if your unit has a back flush- you should do it for 30 mins or so.

300 TDS is really high. If you're in the lower mainland you should be at 8-20 TDS right out of the tap.

[neoh]

scherzo: it doesn't appear to have a backflush, I was looking to do this earlier. I've been running the unit for about 6-8 hours now filling up buckets, so it has had plenty of time to rinse out.

I also don't know if the bottom right is a DI filter. Though I should probably take it all apart and check! The way the system is put together, it doesn't seem as though the unit is put together the way that is described in the video.