[Social D]

What would happen to the quality of the water if the membrane of an RO unit was caput?

[ben]

the tds reading would rise

[chriss]

You will also find that your DI resin will get used up very quickly.

I had to replace my membrane back in the summer after finding that tghe di resin was getting exhausted in no time at all.

I've got one of those twin-inline tds meters where one sensor had been on the input and one on the output, but I have now moved the 'input' one to after the membrane. You kind of know that the input will be high, but now I can see what the water is coming out of the membrane at and out of the di at so it is easy to tell whats going on.

Chris

[karnivor]

chriss, on Oct 31 2009, 05:41 PM, said:

You will also find that your DI resin will get used up very quickly.

I had to replace my membrane back in the summer after finding that tghe di resin was getting exhausted in no time at all.

I've got one of those twin-inline tds meters where one sensor had been on the input and one on the output, but I have now moved the 'input' one to after the membrane. You kind of know that the input will be high, but now I can see what the water is coming out of the membrane at and out of the di at so it is easy to tell whats going on.

Chris

thats exactly the same way I run my TDS meter. Its far better that way. I really dont give a toss whats going in, you cant do anything about it anyway.

[Social D]

Ok thanks, My main one is over 3 years old so i guess it needs replacing, Ive only changed the other filters once aswell

[ben]

havnt you got a tds meter tim?

[Social D]

yeh just tested its 4

[ben]

i change mine at that reading

[karnivor]

TBH, 4 isnt that bad before the DI unit. At best, most membranes only remove 90% of TDS from the water, and so 4 out only represents a TDS of 40 in, which is pretty good for municipal water.
Having said that, you should replace your membrane every 2 years anyway.