[d s windowcleaning]

any ideas what could cause tds to rise to 102ppm basically overnight it was on 000ppm before . just had to waste 1000ltrs of water because of this not to mention a return to the customers to re clean . at the moment tds reading as gone down to 5 ppm i just dont understand the big increase .

[Captain Scarlet]

Is that reading out of your RO? What may have happened is this ( dont know if this is right? ) So for instance say your mains supply was 400 before but for some reason went up to 500 then maybe the RO is having trouble? I really dont know much about RO as my tds here is 24!! Maybe try reading your mains? Luke

[d s windowcleaning]

before ro was 295 , out of ro was 4 , out of di was 0 , left on all night filling static tank tds in static tank 102 , the tds now coming through di is 5 . i just cant work out why this would happen .

[Captain Scarlet]

That is strange, Luke

[d s windowcleaning]

anyone 

[matt]

i trust you didnt mix up the pipes and put the waste into the tank for a while ?? ? ? it sounds silly i know, but i know some1 else who did that

[L.J.Thorpe]

how are you getting the readings inline or handheld or combination

[Pj]

You have to give us more information and maybe someone can help.
What RO and filter system do you use?
Reads like you use a merlin or something smaller as you are slowly filling static tank overnight.

before ro was 295 , out of ro was 4 , out of di was 0 , left on all night filling static tank tds in static tank 102 , the tds now coming through di is 5 . i just cant work out why this would happen .

So, tap water = 295.... then through RO? Whatever setup = 4   Good  Then through di = 0

All you say is that the reading in your static tank went  to .102
And the reading now through di is .005

If it was .005 all night it couldn't possibly leave you with a static tank full of water at .102

1)  Either you have something contaminating your static tank
2)  The quality of the water going in from mains dramatically changed (and it can) during the night
3)  Water pressure dropped dramatically during the night thus effecting filtering
4)  Filters need replacing

You'll have to explain what RO you use.  And if your static tank is fully sealed

[d s windowcleaning]

i use both inline and handheld tds meters ,ro unit is 300 gpd from ro-man with 3 pre filters , 3 membranes and di for last stage. static tank is fully sealed . pipes are not mixed up matt every thing as been fine until last night . i found out when cleaning today . i got home and checked tds in static tank and tds was 102 .previous night it was 0 . i would have thought if my filters were knackerd then the di would have kept tds at 0 or could a big increase happen like ive explained then the tds just drop back down to 5 

[L.J.Thorpe]

i cant see how the filters or ro can be knacked or the reading would not go back down to 5 out of ro i go with pj on contam in static tank or big jump in tds going in from mains.Dont think a drop in pressure could give such a dramatic jump....could it

[d s windowcleaning]

well ive ordered new filters & membranes just to be on the safe side , water stayed at tds 5 all night so hopefully that will help cheers guys .

[brightnclean]

Did you just dip your tank with the handheld TDS meter and it read 102?

How does the inline compare to the handheld?

If it was 102 coming out of the RO/DI system your resin would have been perished and wouldn't have gone down to 5 again.

Contamination of the water in the tank is all I can think of. Sorry to say this but could anyone else have had a reason to do this if they could?

[d s windowcleaning]

yes brightnclean i dipped handheld meter into the tank , the night i turned on the unit tds was 0 , next morning i filled up my van but didnt check id done a few houses when a customer came and told me that her windows were really bad . I went to have a look and they were really bad , thats when i checked my tds and found it to be 102 in static tank . ive wasted just short of a 1000 ltrs because of this the tds is now at 5 after di thats on inline & handheld  . cant think of any reason why anyone would want to contaminate the water .

[brightnclean]

Ok Dave.

Did you change your resin before making some more water?  If you didn't then something or someone definately contaminated the water in your tank. If it were me I would check the tank water every day before you transfer it. Can you check what the reading is out of the RO before it goes through the resin?

[d s windowcleaning]

hi brightnclean no i havent changed di tds before di is 5 then out of di its 5 . ive ordered some new filters & membranes so i will be changeing everything as soon as they arrive . as for someone contaminating the water i just cant think as to why anyone would do that .