Tds rising after Di. why?

[best]

Setup

Softener, Ro, twin Di

Problem

After the Ro the Tds is 8ppm, yet when it goes through the first di it rises to 40ppm, the second di takes it back down to to 0ppm (same batch of resin) why?

The first Di was use successfully for 6 months until it reached 2ppm when I added the second disc vessel thinking I was using the first vessel to the max, thus saving on the price of di.

I have removed the bad di vessel and a I am now using 1 vessel again.

Do twin di vessels work for you.?

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[Scots lad]

You just need to change resin in your first di .You could swap after refilling it to make it your second di vessel,resin don't last forever that's why we need to keep an eye on it

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[best]

You just need to change resin in your first di .You could swap after refilling it to make it your second di vessel,resin don't last forever that's why we need to keep an eye on it

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I don't understand why something that clears the water, would contaminate it.

The rising of tds from 8ppm up to 40ppm.

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[Dave B]

Because that resin is saturated now so has no room left to clean the water so you are in effect flushing the impurities back out into the second di??

 

[The tattood one]

I used twin di for a year..i now use a 25 ltr vessel...had no probs with it...just easier for me to change 1 instead of 2vn swappin em round