[d s windowcleaning]

Looking for a  few ideas as to why tds won't drop below 27
I set up a new 200 gpd ro at the weekend and tds won't drop below 27 ,  everything is brand new and fitted correctly,  I added a di pod yesterday with fresh resin and tds as only gone to 16 .
Tap tds is 292 . Don't understand why it won't drop any ideas what could be the cause of this.
I've set up loads of these ro units but never had this problem before.

[Matt.]

That's just on 90% which isn't to bad,

I am still using the Merlin's and there is some jobs I connect up to where it will give me 008 and other that give me anything upto 101 on one job ( which I definatley didn't bother with ) I will accept upto 030 normally or maybe 040 if am desperate, this all before di

As I have found out it all depends on tap pressure as well as tap tds levels,  I had a job were I checked tds one minute and it was ok and another it was a lot higher, this was down to others using taps inside that ran off the same supply. I was puddled at first what was happening but the pressure kept dropping which affected the RO's

[d s windowcleaning]

So I'm looking at it maybe being a pressure problem

[Matt.]

I don't use a booster pump I just connect up to taps so I guess that why I get such a variation in tds levels. If you have set up all correct and everything else seems fine, it's a possibility.

But I would be happy with 27 from the RO given it's nearly 300 to start with, as for why the di isn't getting it down to 0 I don't know.

I changed my resin last week and ran water through it that was 53 from a tap, no RO I was in a rush and ran this through the di back into tank, it took a good 5-8 mins before the tds level changed from 53 but wen it changed it went rite to 0

At first I was thinking av I got got a dodgy bag of resin  but all good