Clean It Up

UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: Andrew44 on March 27, 2008, 08:12:18 pm

Title: TDS WON'T GO TO 0
Post by: Andrew44 on March 27, 2008, 08:12:18 pm: I've been getting TDS reading of 6 to 8 from RO (4040) but after it has gone through DI it goes down to 1.8 to 2.2 but havn't got it lower than 1.8. Should it really go down to 0 and if so what should I do to get it lowerthan 2???
Title: Re: TDS WON'T GO TO 0
Post by: frames to panes on March 27, 2008, 08:17:22 pm: Should go to zero. Is the container clean your using to measure it in? Is your resin new? If yes to both then see if you can borrow another tds meter?
Title: Re: TDS WON'T GO TO 0
Post by: Andrew44 on March 27, 2008, 08:21:56 pm: Yes to all and Meter 2 weeks old. I've got some calibration solution so I'll re set it and try again. Just can't get it less than 1.7. If I did clean at 2 TDS would that be a problem???

Thanks
Title: Re: TDS WON'T GO TO 0
Post by: cherubs cleaning on March 27, 2008, 08:24:33 pm: Andrew44

softening resin first

jerry
Title: Re: TDS WON'T GO TO 0
Post by: Window Cleaning Services on March 27, 2008, 09:51:21 pm: Quote from: Andrew44 on March 27, 2008, 08:21:56 pm
Yes to all and Meter 2 weeks old. I've got some calibration solution so I'll re set it and try again. Just can't get it less than 1.7. If I did clean at 2 TDS would that be a problem???

Thanks
Try a tds meter that doesn't need calibrating, also run two small di vessels one into the other. 8) Syd
Title: Re: TDS WON'T GO TO 0
Post by: Peter Fogwill on March 27, 2008, 09:53:30 pm: 2ppm won't show up on the glass, probably will be the meter not reading correctly though.

Peter
Title: Re: TDS WON'T GO TO 0
Post by: windowwashers on March 27, 2008, 10:10:08 pm: Quote from: Andrew44 on March 27, 2008, 08:21:56 pm
Yes to all and Meter 2 weeks old. I've got some calibration solution so I'll re set it and try again. Just can't get it less than 1.7. If I did clean at 2 TDS would that be a problem???

Thanks
do you have an inline tds meter by any chance ?
Title: Re: TDS WON'T GO TO 0
Post by: Andrew44 on March 27, 2008, 11:16:50 pm: No hand held as I was told in line are not very accurate. I'll check the meter after I've calibrated it. It may well be right. Resin is brand new and not regenerated..or whatever the phrase is. ::)
Title: Re: TDS WON'T GO TO 0
Post by: RO-Sheen on March 28, 2008, 12:07:55 am: Don't worry too much if you cant get it lower. 2ppm is fine. I am currently working at 5ppm and there is NO difference between the cleanliness of the glass. I usually work at 0 or maybe 1 but I will not change it until it gets to about 7ppm.
Title: Re: TDS WON'T GO TO 0
Post by: chris@c.m.s on March 28, 2008, 12:27:33 am: What size is your Di vessel?
Title: Re: TDS WON'T GO TO 0
Post by: Andrew44 on March 28, 2008, 12:35:17 am: Quote from: RO-Sheen on March 28, 2008, 12:07:55 am
Don't worry too much if you cant get it lower. 2ppm is fine. I am currently working at 5ppm and there is NO difference between the cleanliness of the glass. I usually work at 0 or maybe 1 but I will not change it until it gets to about 7ppm.

Thanks
Title: Re: TDS WON'T GO TO 0
Post by: Andrew44 on March 28, 2008, 12:35:59 am: Quote from: chris@c.m.s on March 28, 2008, 12:27:33 am
What size is your Di vessel?

11ltr with brand new resin.
Title: Re: TDS WON'T GO TO 0
Post by: mark dew on March 28, 2008, 12:55:44 am: The tds comes out after 2 DI vessels higher than it come out of my RO. :o
But after a couple of minutes it is down to zero. Or 1 most of the time.
Title: Re: TDS WON'T GO TO 0
Post by: chris@c.m.s on March 28, 2008, 01:36:03 am: Hmm if its 11ltrs it has to be a faulty tds meter or you are somehow contaminating the water pre Di ,
do you check the Ro tds before putting it through the Di?
Title: Re: TDS WON'T GO TO 0
Post by: Londoner on March 28, 2008, 09:28:39 am: Quote from: Peter Fogwill on March 27, 2008, 09:53:30 pm
2ppm won't show up on the glass, probably will be the meter not reading correctly though.

Peter

You say that, and I would agree except I had a comment from a good long term customer a week or so back that her windows weren't as good as they usually are. On that day I was running with water that was around 2-3ppm prior to changing resin.

I was suprised but she's not a moaner and she hasn't made any comments before.

Strange.