Twin Di Problem

Discussion in 'Water Fed Pole Cleaning' started by chilt69, Jan 6, 2013.

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  1. chilt69

    chilt69 Active Member
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    I've been exterior cleaning for a few years now, mostly patios & gutters, with a few window jobs - all done trad. The window cleaning side has been picking up, and I have decided to add a WFP system to my van - as it'll help wash down windows after cleaning gutters + it'll speed up my window cleaning work.

    I've got some pre-filters already (sediment, carbon) which are between my tap & tank. I've been given a couple of DI vessels from someone, which I think are 4.6lt.

    As I'll only be using around 300 - 400 litres a week, do you think these two DI's will be enough - one before the tank, and one after? The TDS reading after the existing pre-filters is around 230ppm. Obviously I'd like to use the DI's as they were free, rather than spend extra on a RO (though I appreciate the benefits).

    Any advice gladly received!
     
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  2. Newbie123

    Newbie123 Forum Addict
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    Hi chilt69 seen your post earlier and has you've had no response will have a stab at it for you 230ppm seems high to a me as mine lot lower about 25% of your reading would think the two di vessel even though 4.6 would do the trick the problem you will have is the first di will do most of the work and will need resin replacing regularly you can use the resin calculator found on the index page to calculate the cost what you really need to know is will it be more cost effective than ro obviously you can rotate the di vessels to extend life slightly you can fill 1 vessel 5 times from one 25ltr bag approx £80 a bag may be more may be less but good calculator base rate
     
  3. Damo2

    Damo2 Newcomer
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    Christ don't use DI for that will cost a fortune.

    Even with twin DI's you will be looking at around £35/40 per month in resin.

    You would do better buying an RO unit. Then running through a DI or just using the RO water
     
  4. mark m

    mark m Hero
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    chilt69 for the amount of pure water you are using di is the why to go if you say you use 350lt a week a bag of resin will last you 2 months less than £2 a day twin di twice as long and would cost less than a £1 a day
     
  5. Squeak and Bubbles

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    I agree. One job a day @ £10 per job over 7 days will pay for another bag of resin. Personally I think that's cheap to help run ur business. if you have a large round with 400/500 customers or more, than I would then personally get an RO system. This is what I have had to do to be more cost effective, and boy do I know it.
     
  6. Damo2

    Damo2 Newcomer
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    He would be looking at spending around £400 per year on resin.

    If he went the RO route he probably wouldn't even need to change any filters in the first year.

    Apart from being easier (DI) it is wasting money.
     
  7. bluemonkey

    bluemonkey Guru
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    yes di will work, but wont last long, as few days at most, get a ro
     
  8. john p

    john p Member
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    I would stick to a di vessel as well as you are only part time 300lt a week is so little .You will fill it up in no time and no storage problems and you dont have the expense of buying a ro so thats 9 months free pure water already
     
  9. chilt69

    chilt69 Active Member
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    The long term intentions are to invest in a static RO system, once funds allow for the necessary equipment & bigger shed!

    As the DI's (6.9lt, not 4.6lt) were free, the only outlay is the resin for now. Checked the cost calculator thing, and at £1 a day I think thats okay for now.
     
  10. Damo2

    Damo2 Newcomer
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    @ 230ppm your first DI will need changing after about 2 weeks at 300 Litres usage per week.

    You can chop and change the DI's to get the most out of the resin, But you are still going to be talking £30/£40 per month.

    RO could be had for less than £100

    Tank 2nd hand £75

    Pipes and misc £25

    Shed ( 350L aint that much to store)

    So for £200 you would have water Being produced at 7ppm

    After using resin for 6 months, you could have bought the above set up.

    You could even sell the DI's or one.

    Anyway, best of luck with what you do :)
     
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