[dazmond]

there seems to be a bit of confusion in my other posts on this subject for some reason.

single DI purifying straight into tank,when this vessel starts to rise after around 3 months(say 005).i then put a fresh vessel IN FRONT of this vessel then when the original single DI gets to my tap tds level(30-35) i bin it and continue to use the single second vessel until that starts to rise and the cycle continues.

why on earth would i continue to use double DI ALL THE TIME if the original single vessel rises ABOVE my tap tds?this would make the second vessel work harder to purify water thus using MORE resin?

hope thats clearer?(smudger/dave! )

[samson]

I know what you mean, but it's just easier, and it saves having to check the old resins tds !     Would be interesting to know how high the old resins tds rises to when the double DI creeps over 000.      I will check when I chane the resin nes=xt time 

[Positivity]

You have to check the first vessel TDS it can accumulate to a level way beyond the TDS of the tap water going in to it.  I have seen it up to 170 when I forgot to check it with tap water of 85 going into it and 170 coming out!

[Dave Willis]

You're arse backwards Dazmond - nothing new!

You put the old vessel before the new one not after it you halfwit!

Then, when your tds starts to rise you bin the first one then shove your slightly depleted ex new one first inline and put a fresh one last in line. Jesus 
The fresh one is always LAST in line and you always have two on the go.

[Don Kee]

If you read his description, i think thats what he means dave...

His wording is iffy, granted, but when he says 'in front' i think he means 'after'
(he then goes on to say he bins the first vessel and continues to use the second, which, if he does literally mean 'in front/first', would be daft as both vessels would have a higher tds than 0!!)

[Dave Willis]

 Must be a Mancunian thing.

[samson]

Must be a Mancunian thing.

Mad for it 

[M & C Window Cleaning]

Reading this post with interest and perhaps a diagram will help:



Have I got this right?

When vessel No.1 reaches same tds as tap, the resin in it should be discarded.

Vessel 2 should be moved to the position of vessel 1 (in front) and the empty vessel filled with fresh resin and placed in position 2 (behind)

So you constantly measure the tds of vessel 1 and when it rises to tap level you replace the resin in it and perform the above vessel exchange.

Vessel No.2 should always have the freshest resin in it.

This makes sense to me.

[Stoots]

Daz just way complicated it

what he means is

he uses 1 vessel until this gets to 005
then he puts a fresh vessel AFTER the first vessel
when the origianal vessel (nearest the tap) rises to his tap td level he removes this vessel and uses the fresh vessel (which is no longer that fresh)

I wasnt aware the tap tds could ever be more coming out of a d.i vessel than it is going in, which is what surprised me, i will have to check mine

[dazmond]

front means behind in the diagram but yes thats what i meant.

[Dave Willis]

But ....... the diagram has two vessels - at no point do I ever run with one. When does it make any sense to run with one Dazmondo?

I only meausure the tds of vessel No2. As soon as it starts to rise then it goes to the back and a fresh one takes its place.

[dazmond]

i only need to use one vessel dave most of the time as its 000.only when it rises do i put another fresh one behind it in line until the resin in the original vessel is spent(usually 3-4 weeks) then i go back to one vessel(25l) again until that one rises(which could take 3 months of daily use) and so it continues.

[M & C Window Cleaning]

I wasnt aware the tap tds could ever be more coming out of a d.i vessel than it is going in, which is what surprised me, i will have to check mine

I have experienced this too. Came out of my RO at 004, went into DI and came out at 076. It's like the resin got to a point where it got tired of holding on to all the gunk and just let go and dumped it all back into the water passing through it.

[Matt.]

That diagram is what I have to do when I am desperate for water ... Only thing different is I fill the tank with tap water now and run it through 2 x 11L Di bottles and back into the tank ( using the wider garden hose and separate bottles to the one I have before hose reel ) as am driving about so it gets a good filter

I try to only use the final one as emergency before hose reel just incase, as am not Into letting tds rise at all, never mind some numbers on here 
Ideally I like to use the RO but needs must sometimes,

[ChumBucket]

It's because Dazzler's input TDS is so low that he can remove a vessel when it reaches 35ppm. Because my input TDS is approx 90ppm, my older resin never goes above this before the fresh stuff starts to rise anyway.

[dazmond]

Thank you chum bucket! Yes you re right.tap tds is  usually between 29-35.

[gary999]

I wasnt aware the tap tds could ever be more coming out of a d.i vessel than it is going in, which is what surprised me, i will have to check mine

I have experienced this too. Came out of my RO at 004, went into DI and came out at 076. It's like the resin got to a point where it got tired of holding on to all the gunk and just let go and dumped it all back into the water passing through it.

If it comes out at 004ppm why bother with a DI...the difference between 000ppm and 004ppm
in real terms when using is literally nothing

[richard groves]

I cant understand why if you are di only you would not fill the tank from tap and di after pump at point of use ?  And if you use a flow controller then the slower the flow of water the longer the resin lasts whether double di or not.

[dazmond]

I cant understand why if you are di only you would not fill the tank from tap and di after pump at point of use ?  And if you use a flow controller then the slower the flow of water the longer the resin lasts whether double di or not.

I don't want the DI vessels in the van mate.they take up room and leak after a while.also they can freeze up in winter.

[Cookie]

My tap TDS is 53. I use double DI as described above. Just pondering whether there would be any benefit in using triple DI....