DI

« **on:** July 05, 2012, 08:49:20 pm »

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!

« **Reply #1 on:** July 07, 2012, 09:07:48 pm »

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.

« **Reply #2 on:** July 07, 2012, 09:13:22 pm »

I go tank - pump - DI - hose

« **Reply #3 on:** July 07, 2012, 09:29:21 pm »

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?

« **Reply #4 on:** July 07, 2012, 09:44:45 pm »

Quote from: LWC Ltd on July 07, 2012, 09:29:21 pm

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.

« **Reply #5 on:** July 07, 2012, 10:01:15 pm »

I do same as James.

« **Reply #6 on:** July 07, 2012, 11:59:33 pm »

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.

« **Reply #7 on:** July 08, 2012, 08:40:48 pm »

Looks like there's some difference of opinion on this one then?

« **Reply #8 on:** July 08, 2012, 08:44:43 pm »

can't see why people use di after a pump, why not just fill the tank with pure and just pump it out

« **Reply #9 on:** July 08, 2012, 08:49:39 pm »

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.

« **Reply #10 on:** July 08, 2012, 09:12:26 pm »

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.

« **Reply #11 on:** July 08, 2012, 09:23:25 pm »

tank-pump-twin 11 litre di-hose reel.

can fill up from customers tap and keep working.

« **Reply #12 on:** July 08, 2012, 09:31:04 pm »

Quote from: Paul Coleman on July 08, 2012, 09:12:26 pm

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.

« **Reply #13 on:** July 08, 2012, 09:34:40 pm »

Quote from: Ian WW on July 08, 2012, 08:44:43 pm

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!

« **Reply #14 on:** July 08, 2012, 11:26:41 pm »

Quote from: ♠Winp®oClean♠ on July 08, 2012, 09:34:40 pm

Quote from: Ian WW on July 08, 2012, 08:44:43 pm
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!

« **Reply #15 on:** July 09, 2012, 01:30:08 am »

Quote from: Ian WW on July 08, 2012, 08:44:43 pm

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?

« **Reply #16 on:** July 09, 2012, 07:21:30 am »

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.

« **Reply #17 on:** July 09, 2012, 07:23:43 am »

Quote from: Mark Etting on July 09, 2012, 07:21:30 am

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.

« **Reply #18 on:** July 09, 2012, 07:25:45 am »

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.

« **Reply #19 on:** July 09, 2012, 09:21:58 am »

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.

Poll

Which set up do you recommend and why?