RODI flush valve left on for months, consequences for system?

DeepSeaPhilosopher

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(Sorry for the wall of text, in short I have been using my RODI filter with the flush valve always turned on while in use, have I destroyed my RO membrane? Water TDS is reading 0, so maybe it's ok?)

So I bought a RODI filter a while back and I finally got around to changing the filters today. While I was looking around to figure out what I needed to do I realised I had been using it completely wrong.

It's a 4 stage system, and has (what I now know is) a membrane flush valve built in on top. There are two valves, one from the water line into the RO that I turn on before use, and the other valve on the system. In the instructions it had said to turn the valve on before use, reading online now it must have said to turn it back off again when you go to use it. So every time I've been using it I've had both the water valve and the flush valve on.

I assumed this was the way to use it, and that the valve on the system was essentially a secondary valve to stop water that's still in the system from leaking out after you put all the hoses away. Also, it always sounded like the system was under a lot of stress if I turned off the flush valve before the water valve. I just filled a tub though with the flush valve down, and realised it just takes some time for the water to run through and the system to settle down.

So, what are the consequences of this? I had been getting low TDS readings on the water which is why I thought it was working as intended, but it's reading 0 TDS now which is obviously ideal. Have I probably used up most of the RO membrane's lifespan? I read these things usually last a long time but I assume i've been sending at least a lot of water directly through the membrane? The filters were still quite dirty when I changed them, but it has been quite a while of use.
 
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DeepSeaPhilosopher

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AZDesertRat

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The only thing you have done is waste hundreds or thousands of gallons unnecessarily and shorten the life of your DI resin since sending the water to waste reduces the pressure and efficiency of the RO membrane.
You need three TDS readings to know though. Tap TDS, RO only TDS before the DI and final RO/DI TDS.
 
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DeepSeaPhilosopher

DeepSeaPhilosopher

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The only thing you have done is waste hundreds or thousands of gallons unnecessarily and shorten the life of your DI resin since sending the water to waste reduces the pressure and efficiency of the RO membrane.
You need three TDS readings to know though. Tap TDS, RO only TDS before the DI and final RO/DI TDS.

RO only TDS is water coming out with flush valve on? Tap TDS is around 110, Final is 0.
 

AZDesertRat

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No, with the flush valve open its basically tap water going down the drain. With the flush valve closed or if it were mine, removed, the waste would be about 20-25% higher TDS than tap since it contains the TDS from the treated water concentrated in the 4:1 waste stream.
If things are working correctly and your tap TDS is 110, you should be seeing a RO only TDS of 2-3 and RO/DI TDS of 0. Your waste ratio should measure out at between 3:1 and 4:1 and the TDS of the waste should be around 130-140.
 

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