Clean It Up

UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: Leeds on October 21, 2014, 08:16:49 pm

Title: At what PPM is RO better than DI?
Post by: Leeds on October 21, 2014, 08:16:49 pm: At what ppm does it make it cheaper to use RO instead of DI?
Title: Re: At what PPM is RO better than DI?
Post by: elite mike on October 21, 2014, 08:23:53 pm: at a guess i would say 50
Title: Re: At what PPM is RO better than DI?
Post by: Steve foster on October 21, 2014, 08:33:31 pm: If you mean tap TDI then mine is 125. After the RO it is down to zero so no need for for DI.
Title: Re: At what PPM is RO better than DI?
Post by: Plankton on October 21, 2014, 09:26:45 pm: Quote from: Meridion on October 21, 2014, 08:16:49 pm
At what ppm does it make it cheaper to use RO instead of DI?
Good question. I sold some old equipment at the weekend and two people that have a few guys on trad where asking about setups, but I could only answer with the knowledge of a DI user. I haven't got a clue about RO and where the wastage goes and like your asking what would be beneficial for the user of a low TDS.
Title: Re: At what PPM is RO better than DI?
Post by: Leeds on October 22, 2014, 12:35:41 am: Quote from: Alan Ritchie on October 21, 2014, 09:26:45 pm
Quote from: Meridion on October 21, 2014, 08:16:49 pm
At what ppm does it make it cheaper to use RO instead of DI?
Good question. I sold some old equipment at the weekend and two people that have a few guys on trad where asking about setups, but I could only answer with the knowledge of a DI user. I haven't got a clue about RO and where the wastage goes and like your asking what would be beneficial for the user of a low TDS.

Yeah at what PPM would it be too expensive to use resin (because it would cost more in a year) than RO?
Title: Re: At what PPM is RO better than DI?
Post by: SeanK on October 22, 2014, 08:59:21 am: It would also make a difference if your water was metered or not, but for non metered water
it would be cheaper to use R.O.
Title: Re: At what PPM is RO better than DI?
Post by: Nathanael Jones on October 22, 2014, 09:03:24 am: If you're not metered then about 80ppm is a point where you'll quickly recoup the cost of buying an RO - - if you are on a meter 100 - 120ppm.

Above 150ppm you'd be nuts to use DI only.
Title: Re: At what PPM is RO better than DI?
Post by: Leeds on October 22, 2014, 09:29:07 am: Quote from: Nathanael Jones on October 22, 2014, 09:03:24 am
If you're not metered then about 80ppm is a point where you'll quickly recoup the cost of buying an RO - - if you are on a meter 100 - 120ppm.

Above 150ppm you'd be nuts to use DI only.

Thanks Nath!
Title: Re: At what PPM is RO better than DI?
Post by: Mike #1 on October 22, 2014, 03:40:16 pm: At a tap tds of 75ppm you would be looking at spending over £300 per annum depending on DI set up size of vessels etc . You can get an RO for a lot less .
Title: Re: At what PPM is RO better than DI?
Post by: The Jester of Wibbly on October 22, 2014, 04:03:03 pm: For me, I calculated 90tds would be the break even point if on a water metre as you would be paying the same for the resin as you would do the extra water cost.

Plus it will save time filling your tank even if you break even.