Clean It Up
UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: LWC Ltd on July 05, 2012, 08:49:20 pm
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Would appreciate your help in setting up my new system please...
Is it better to push or pull water through DI vessels? - and why?
(I'm using twin DI)
Thanks everyone!
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I'm thinking
DI - Tank - Pump - Pole
But I need to be careful not to pass the water too fast through the DI when filling the tank, right?
I have two twin 5.6 L DI vessels.
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I go tank - pump - DI - hose ;)
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Thanks for your input James,
Can I ask, do you get air-lock issues or pressure build up issues having the DI after the pump?
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Thanks for your input James,
Can I ask, do you get air-lock issues or pressure build up issues having the DI after the pump?
Nope, no problems with it at all mate.
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I do same as James.
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Twin 11lre DI's...... tank>pump>DI's>hose.
You're more prone to air ingress by pulling water through these parts rather than pushing it. There should be no connections between your tank & pump inlet thus less likely to pull in air. Have your pump as low to the van floor as possible but if it's higher than the tank fit a non-return valve just before the pump inlet. ;)
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Looks like there's some difference of opinion on this one then?
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can't see why people use di after a pump, why not just fill the tank with pure and just pump it out
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I suppose it's the reassurance that the DI is close to the pole.
This way pure water produced has no tank and pump to go through - I'm guessing less chance of Tds rising on its journey.
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I do Tank - pump - DI -pole.
The DI in the van doesn't do much though as it's pure when it leaves the holding tank. It's only there in case I'm working a long way out and need to finish a job off with tap water to save returning.
It's set up like that because that's the way it was done for me and I've never had a need to change it.
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tank-pump-twin 11 litre di-hose reel.
can fill up from customers tap and keep working.
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I do Tank - pump - DI -pole.
The DI in the van doesn't do much though as it's pure when it leaves the holding tank. It's only there in case I'm working a long way out and need to finish a job off with tap water to save returning.
It's set up like that because that's the way it was done for me and I've never had a need to change it.
Ill eventually have a tank in the garage, and use my RO thats sat in there, then pump the pure to my van. Just havent got round to it yet as making do with just using DI.
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can't see why people use di after a pump, why not just fill the tank with pure and just pump it out
You obviously never will either. I've explained it a thousand times on here on topics you were involved in!
Stick to RO topics! ;)
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can't see why people use di after a pump, why not just fill the tank with pure and just pump it out
You obviously never will either. I've explained it a thousand times on here on topics you were involved in!
Stick to RO topics! ;)
;D
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can't see why people use di after a pump, why not just fill the tank with pure and just pump it out
That's exactly how I see it.
What's so complex about having a tank of pure water and using it?
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Because if you live in an area with a low tds, then you don't need to use an RO or a holding tank. Just fill your van tank from the tap and go.
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Because if you live in an area with a low tds, then you don't need to use an RO or a holding tank. Just fill your van tank from the tap and go.
Exactly. Or a pump to get water from holding tank to van. ;)
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Personally I would prefer to suck through the DI. The reason being that when I had this kind of set up I got an air lock which made the pump run on to the extent that the DI blew the top and ruined the thread.
Works either way.
The last option on the list is probably not the best because of the speed and pressure of the tap water rushing through the resin.
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Boys lets get it right for once. Try give the man facts, to many guess work going on here. At this point I would not know what to do so much onions. I am surprised any one learns a thing from this forum. ??? ???
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Boys lets get it right for once. Try give the man facts, to many guess work going on here. At this point I would not know what to do so much onions. I am surprised any one learns a thing from this forum. ??? ???
They don't, you tell 'em, tell 'em & tell 'em & they still don't get it!
It's very simple, think about both ways, then see if you can come up with any benefits of filling the tank with pure over filling it with tap water? ;)
As for the sequence of the DI's, pump etc it will work both ways- depending on how airtight your system is & the position of the pump etc will determine which works best. In my experience, having tried both over the last 8 years or so, it's a much more reliable/stable system when you push water through the vessels rather than pull it. ;)
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just take winpros advice,no point in complicating things, just try it.and no running out of water.
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From what i've read I'm in favour of being able to fill from customers tap quickly and pushing it through DI's (more slowly).
This seems more sensible but what worries me is the pressure build up in the vessels if I stop flow with an aquadapter or similar.
Eg heads of vessels blowing off as mentioned. Surely the pressure switch of the pump would turn the pump off before getting to that point?
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From what i've read I'm in favour of being able to fill from customers tap quickly and pushing it through DI's (more slowly).
This seems more sensible but what worries me is the pressure build up in the vessels if I stop flow with an aquadapter or similar.
Eg heads of vessels blowing off as mentioned. Surely the pressure switch of the pump would turn the pump off before getting to that point?
Mark etting will love me for this but.... I think his case was pretty unique! ;D
Water doesn't compress, only air, so you really need to have an issue to begin with for this to happen- even then a pump & controller working properly would cut off at your predetermined value.
I've had air in the vessels before & yes, the pump will run a little longer before the controller cuts it off as the air compresses but NOTHING near to causing anything, even a hozelock connector to pop off! ;)
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Not sure why you would put more strain on the pump by pushing water through a di. Mains pressure is less than the pump can produce so surely that's better for the di as well. You can also fill at a customers house by connecting straight into di.
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Not sure why you would put more strain on the pump by pushing water through a di. Mains pressure is less than the pump can produce so surely that's better for the di as well. You can also fill at a customers house by connecting straight into di.
Well for one- there is virtually no resistance offered by two filled, operational DI vessels! Water flows freely through them.
The pumps pressure is controlled by either it's own pressure switch or via electronic controller.
On your last point- yes you can, however, blasting water through DI vessels at mains pressure/flow rate is a sure good way of reducing your resin life!! Flow rate & volume are key factors in extending resin life- especially important in a twin DI system!
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What happened with mine was .. I had a layflat tank (650l), so when it got really low the pump would gulp in air when the van was moved and cause problems. The biggest build up of pressure I had was when the battery was nearly flat, for some reason the controller couldn't pick up on the pressure and wouldn't switch off. Apparently this can happen and was explained by an electrician - unfortunately it was so long ago that I can't remember the details. ;)
Push or pull, doesn't make a huge difference provided all the connections are sound.
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im fed up with proving wimpo wrong . if your main concern is the life of your resin . then put your di before your tank and fill it with pure . this is what i do . i put my tap on trickle abot 4 in the afternoon and by 7 in the morning it is full . 15 hours to fill and 7 hours to empty while working . my record for filling my tank is 50 hours over the weekend . giving more resin life than than having the di after the tank .
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Think I'm getting closer to a decision now then . Will probably push through the DI and fill tank with tap water.
(I'd like the option to fill the tank quickly)
Flow rate & volume are key factors in extending resin life- especially important in a twin DI system!
Do I understand correctly if I take this to mean a slower flow rate and big vessels?
What difference does it make?
My two vessels I've just got are 5.6L each I think. (The black super duper ones from WCW)
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Think I'm getting closer to a decision now then . Will probably push through the DI and fill tank with tap water.
(I'd like the option to fill the tank quickly)
Flow rate & volume are key factors in extending resin life- especially important in a twin DI system!
Do I understand correctly if I take this to mean a slower flow rate and big vessels?
What difference does it make?
My two vessels I've just got are 5.6L each I think. (The black super duper ones from WCW)
With such small vessels you'll deffo have to pump through them. My mate has the same vessels as those, he just has to change the resin more often. ;)
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im fed up with proving wimpo wrong . if your main concern is the life of your resin . then put your di before your tank and fill it with pure . this is what i do . i put my tap on trickle abot 4 in the afternoon and by 7 in the morning it is full . 15 hours to fill and 7 hours to empty while working . my record for filling my tank is 50 hours over the weekend . giving more resin life than than having the di after the tank .
Oreyt Bazza ;)
Now, this is what I totally fail to see any logic in whatsoever! ???
Why on earth would you do that? Spend 15 hours filling your tank (just think about winter for one) when it could be done in 15 minutes! ???
I can guarantee you Bazza, at both flow rates here (pump Vs trickle mains) there will be virtually zero, if any at all saving on resin & even if there was, it would be so minute that your method still presents itself as ridiculous! ;D
This is all I have to do when I come home from work- Pull up, plug hose pipe into hozelock male tank filler & turn tap on! That's it, done 'till I start work the next day. ;)
I have a mini torbeck float valve so it's impossible for me to over-fill too, it will just cut off once full so I don't even have to stand there & wait 10/15 mins 'till it's full. :D
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My mate has the same vessels as those, he just has to change the resin more often
I've heard that bigger vessels extend resin life but I can't get my head around why?
Surely like Winpo says the resin needs changing more often and that's the only difference.
I would have thought the only factor influencing the resin life (apart from the Twin DI set up etc) is the amount of water that passes passing through the vessels?
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My mate has the same vessels as those, he just has to change the resin more often
I've heard that bigger vessels extend resin life but I can't get my head around why?
Surely like Winpo says the resin needs changing more often and that's the only difference.
I would have thought the only factor influencing the resin life (apart from the Twin DI set up etc) is the amount of water that passes passing through the vessels?
I don't see how bigger vessels extend resin life, it would just last longer between fills as it holds more resin.
Flow rate comes into it more as the resin gets older. The more it gets spent, the less it's ability to absorb impurities & the faster the through flow the lesser it's able to do so.
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ay up wimpo . i might save an extra 10p a day on my resin having the tap on trickle . remember i am from yorkshire . ;).anyway ive got about 600 bristles from some gardiners brushes hanging around on custys windows . if you want i will collect em and post em for you. you might be able to make another feather duster out of em ;D
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ay up wimpo . i might save an extra 10p a day on my resin having the tap on trickle . remember i am from yorkshire . ;).anyway ive got about 600 bristles from some gardiners brushes hanging around on custys windows . if you want i will collect em and post em for you. you might be able to make another feather duster out of em ;D
So am I Bazza, I know where you're coming from ;D but even I have limits! :D :D