Which Size D.I. Vessel - Cost Effectiveness?

Discussion in 'Water Fed Pole Cleaning' started by James, Jan 26, 2012.

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  1. James

    James Guru
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    Long story short...

    I am looking at buying another tank to store in my garage facility to make pure water. I'm currently making it straight into my transit which is becoming an ever increasing pain as I'm having to move my booster pump outside everytime I need to re-fill my tank. I wan't a nice little set-up in my garage composing of a Merlin RO System (currently in my van also), Booster Pump, 650 litre Tank and a D.I. Vessel.

    Then I will be able to work in the day while producing it at the same time. I can then bilge pump it straight to my van after my shift in 10-15 minutes.

    But my question is: My current D.I. Vessel in my van is 11 Litre. This takes up nearly a whole bag of Tulsion a time (£70). Would it be more cost efficient to buy a smaller D.I., for example, 4.6 litre vessel to produce my pure water? Has anyone done the maths to work out how much pure water you can produce with an 11L vessel and a 4.6L Vessel, before changing the vessels?

    Basically how much pure water can you make with both sized vessels before changing the vessels resin thus trying to save money.

    Hope that makes sense, I tried.

    James.
     
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  2. chip

    chip Guru
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    a smaller vessel will just need changing more regular. i'm not quite with you, why not just either leave your current di in the cessel and make it pure at home and then just clean with that after transfer? or you could, as some do have a smaller di in the van and use as a polisher if you're in doubt.
    by the way james when the tds starts to rise, have you tried giving it a shake? that can give a bit more resin life, as can taking it out and putting it back in[hr]
    oh, have you tried gardiners resin calculator? that would tell you what you can expect to produce
     
  3. James

    James Guru
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    Maybe I'm not making myself clear. I want to know what will be cheaper resin wise and which vessel will produce more pure water using as little resin as possible,for example:

    For example purposes say I have the 2 sized vessels (4.5L & 11L) and 5 bags of 25L Resin, which one will produce the most pure water after all the 5 bags have been used.

    Because at the moment I use one full bag to fill my 11 litre vessel, I'm just wondering If I had a smaller vessel could I keep re-filling it to produce more pure water or could I produce more just by filling the 11 litre vessel once than re-filling the little one lots of times.

    Oh and cheers for the tip Chip as I didnt know that!

    James.
     
  4. chip

    chip Guru
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    it'll be more or less the same i expect, some people double di, but they say that it does'nt seem to make much difference, which surprises me i would expect that you'd get more that way. only difference is you have to change more often!
    are you sure you have 25 ltr sacks? i thought you got a couple of fills for an 11ltr vessel? the numbers suggest so
     
  5. James

    James Guru
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    Yeah it was just an example :) Can't remember the actual sizes. Yehh I was just wondering if you could get more fills from a smaller vessel equaling more pure water.

    Cheers for your knowledge Chip.

    James.
     
  6. Mark Henderson

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    I think i know what you're getting at

    The bigger the vessel the more resin you have to throw away as the tds rises.

    The thing is the more resin there is the more water it can potentially produce so it's 6 or 2 threes.

    Try shaking the vessel when it starts to rise. Sometimes brings it back down a bit.

    If you are di only then with a 4.5 vessel you'll be forever having to change the resin.

    Why not get another 11 litre vessel and as the TDS rises in the first one use that as the pre filter for the second vessel full of new resin. Then when the second vessel starts to rise, move that one to become the pre filter and so on and so on...

    That way instead of throwing away resin when the tds starts rising you are using it to reduce the tds of the water input and so the new resin is not working as hard to purify the tap water.

    Rainwater harvesting is another great resin saver.

    As said you should be filling 2 11L vessels with a 25L bag and still have some left over.
     
  7. James

    James Guru
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    Thankyou for your input Mark!

    I see so run two 11 litre vessels? one as a weakener so to speak and the other as the full filter. Thats an excellent idea. I currently run my tap water through my booster pump into the Merlin RO then through my 11 litre DI then into the tank.

    Rainwater harvesting, another brilliant idea, thanks!

    James.
     
  8. Mark Henderson

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    Actually I hadn't read your initial post correctly. I didn't see you'd be using a merlin RO system.

    In that case your di vessel should last ages anyway so not that imperative to use 2 di.

    What's the tds of your tap water?
     
  9. Hinty

    Hinty Well-Known Member
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    Really good DI resin calculator on gardiner's web site:

    http://www.gardinerpolesystems.co.uk/acatalog/De-Ionisation_Calculator.html
     
  10. chip

    chip Guru
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    nice one! i could'nt put the link in
     
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