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Leeds

  • Posts: 181
At what PPM is RO better than DI?
« on: October 21, 2014, 08:16:49 pm »
At what ppm does it make it cheaper to use RO instead of DI?
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elite mike

Re: At what PPM is RO better than DI?
« Reply #1 on: October 21, 2014, 08:23:53 pm »
at a guess i would say 50
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Steve foster

  • Posts: 90
Re: At what PPM is RO better than DI?
« Reply #2 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.
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Plankton

  • Posts: 2441
Re: At what PPM is RO better than DI?
« Reply #3 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.
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Leeds

  • Posts: 181
Re: At what PPM is RO better than DI?
« Reply #4 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?
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SeanK

Re: At what PPM is RO better than DI?
« Reply #5 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.
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Nathanael Jones

  • Posts: 5596
Re: At what PPM is RO better than DI?
« Reply #6 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.
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Leeds

  • Posts: 181
Re: At what PPM is RO better than DI?
« Reply #7 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!
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Mike #1

  • Posts: 4668
Re: At what PPM is RO better than DI?
« Reply #8 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 .
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The Jester of Wibbly

  • Posts: 2256
Re: At what PPM is RO better than DI?
« Reply #9 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.
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