[jonisondell]

just put a pure water system together have a 6.9 l di vessel but not produced any water yet, keep on seeing reports that your di vessel should be over 11L any ideas?? cheers for you reply

[Pristine Clean]

Well the post is lacking a bit of info.

What system do you have is a a standard DI system or have you an ro? ect?
How may litres/ gallons of water do you want to produce?

Dave

[jonisondell]

hi sorry 300 gallon ro-man and 6.9 l di vessel, currently traditional but want to get rid of those ladders have 250 l water tank, currently do about 6/7 jobs a day thanks in advance

[Pristine Clean]

when you say it has not produced any water yet... how long has it been running.

I dont think you have an issue with the 6.9l DI unit size... as this sixe can be run on a 2000 litre a day RO.

Whats ya water presure like?

[jonisondell]

hi ive just set it up in my van not tested it yet, i think water pressure is quite low, been wondering why do some people just use a di vessel only i thought you had to have an ro and di

[Pristine Clean]

if you water presure is low you will not produce that much.

People use a DI if in a soft water area. And use an RO if in a hard water area.

Or use a DI and RO the DI  take all the stuff out and protects the RO unit. Makes it last longer.

You may require a continuous flow pump if presure is low and you are not producing enough.

Hope that helps

[jonisondell]

hi i live in hard water area, i dont understand take all the stuff out?? do you mean you use the di before the ro?? i nthought you filter through the ro into a tank, then from the tank through a di to the wfb cheers jon

[windowwashers]

hi i live in hard water area, i dont understand take all the stuff out?? do you mean you use the di before the ro?? i nthought you filter through the ro into a tank, then from the tank through a di to the wfb cheers jon

There are different ways people do things,

I have an onboard 4040 system that I can fill up from anywhere if I run out (happened once with a 650L tank), I also have a static system that I pump into van tank at 000, I personally do not pump dirty water into my tank and di filter as I go for the reason if I was on a job and tds went up I would not be using pure water and that to me is not an option (because I am funny like that) I know when my water is in the van it is 000 no messing about or checking all the time which I know full well I would do.

As for Di vessal size, it depends on how much water you use, and how often you want to be changing it, having twin di vessals saves on the amount of resin used  but thats another story

[DASERVICES]

If the flow rate through the DI Vessel is high (tap pressure) then anything lower than 10l is not efficient. Water has to flow through enough surface at that rate to exhaust all the resin.

What you will find is resin will be exhausted quicker with a smaller di vessel but in fact is still good. A little test you can do is when it reaches 001ppm turn the flow rate right down and it will drop down to 000ppm.

It's all in this physics, flow rate vs volume.