Di resin problems

Discussion in 'Water Fed Pole Cleaning' started by WinWiz, Dec 1, 2014.

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  1. WinWiz

    WinWiz Member
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    As some of you know, I bought a Pure Freedom van fitted system a year ago. Recently, I've started having a consistent problem with the DI Resin. It only seems to last 2 weeks! I've had this problem now for 4 months. It's costing me a fortune! I really can't afford to change the resin every two weeks.

    After 2 weeks, the water reading goes from between 0-2 all the way up to 12. Has anyone had this problem before? The RO produces 45 before it gets pushed through the DI Resin. I've tried asking the guys at Pure Freedom but they are stumped. Can anyone guide me?
     
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  2. Smurf

    Smurf Banned
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    If your are pushing 45 ppm through the di resin it's not going to last very long for sure.
    You should be looking at replacing the ro surely as at 45ppm output it seems fooked to me.

    What size di tank do you have ?

    Have a play on this to get a rough idea how long resin should last http://www.gardinerpolesystems.co.uk/Resin Calculator.htm
     
  3. Smurf

    Smurf Banned
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    Also what ro are you using and what is your tap tds?
     
  4. doug atkinson

    doug atkinson Well-Known Member
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    Is it resin direct from them, not MAG mixed bed by any chance!
     
  5. WinWiz

    WinWiz Member
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    #5 WinWiz, Dec 1, 2014
    Last edited: Dec 1, 2014

    WOW!!! That's why I love this site!! That's a fantastic link!!
    I put my stats in and it came out at two weeks! Which is exactly what's happening! :)
    Thanks so much!!!! :D
    I have a replacement RO at the ready. Will get cracking getting that swopped out now.

    (Wall Tap TDS reading is 260 btw. I have a booster pump for the RO too. I buy the Ultratec RO unit and the Tulsion resin from Pure Freedom)
     
  6. SPCleaning

    SPCleaning Guru
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    I have no RO. Tap water is 60. I pump through two 11ltr DI's on demand. I use 2000 ltrs per week and resin lasts a min of 6 weeks before I change, allowing TDS to reach 002.
     
  7. Smurf

    Smurf Banned
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    Nice one & I'm glad I have been some help :thumbsup:

     
  8. spruce

    spruce Grand Master
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    I'm a bit surprised to hear that Pure Freedom are stumped.

    It sounds to me as though the membranes have seen better days as per Smurfs evaluation. Your r/o is only working to an efficiency of 83% with your tap tds and output after membranes but before di.

    On most r/o's you should be runing at around 97 - 99%, meaning that your pure should be coming out at around 4 - 8 ppm.

    If you have to replace membranes a good idea is to mark each pipe membrane housing with a pipe number, ie 1 to 9, with masking tap and then wrap a piece of masking tape around each pipe you remove and write the number on it. You will then be able to put it back exactly the way you took it apart. I've known cleaners get pipes mixed up and contaminating the pure by coupling a waste into it by mistake.

    If you haven't been doing your maintenance properly, like replacing the prefilters, then it is likely that chlorine from your tap water has destroyed your membranes. Its very important that prefilters, especially the carbon block filter is replaced regularily according to water used.

    If you have a typical RoMan type r/o then it is likely that the waste to pure ratio is 3 to 1. So for every litre of pure you produce you will use 4 litres of water from the tap. If you are using a Fiberdyne filter from Gardiners for example, a 10" filter will remove the chlorine from 37,000 litres of water. That's 9 x 1000 litre IBC tanks of pure water. If you use 400 litres per cleaning day, then you need to be replacing these filters every 23 working days - approx once a month.


    In the early days our 450GPD would bring our tap water down from 254 to 4.
     
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  9. Tuffers

    Tuffers Hero
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    Same.
     
  10. Duncs

    Duncs Grand Master
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    So how often should you change your membrane I've had mine in now 14months changed the pre filters once
    At the moment using 800lts per day my resin is lasting 5weeks
     
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