[jouk45]

i have seen a few topics on folk claiming doubling up there di vessels, and claiming to get 3 times longer, some how i can not see that happening, for instance if you have for argument sake, 50ppm 1 vessel you get 4 months, so if you double up you should just get around 8 months, i just can not see how it can give you 12months, or longer, i think it just saves on changing resin, or no one has really done an accurate record of water they have used, or less work than normal, i could be wrong, what do you guys think

[macmac]

First thing- using dowex (as oppose to purolite) resin makes a massive difference with a 2 DI vessel set up. don't ask me the science but dowex holds a low tds for ages.

vessel 1 starts to rise tds untill it gets to where you would normaly change it- say, 002/003ppm. So now, with only one vessel you throw the resin & fill with fresh. You've just thrown resin away that is still purifying water

So, don't do the above.
Get a second vessel & fill IT with fresh resin & put vessel 1 (above) in front of your new second vessel. Thus- your new resin (in vessel 2) is now filtering water with an input tds of 002/002ppm (from vessel 1) instead of full blown tap water at (in my case) 96ppm.

The second (fresh) vessel is being pre-filtered by the resin you would have thrown away in vessel 1.
Just like running RO water through the new vessel now.

Now you have the two vessels, you just keep the sequence going & give them a good shake when the tds starts to rise to get the maximum efficiency from them.
It works, take my word for it, it realy works.

tony

[macmac]

Just to add to that, i'm not sure about 3 times more use but i personaly get at the very least twice as much use from the resin this way but not as much as 3.

tony

[jouk45]

yes it does make a bit of sense, i have been working on daseservices theory, when the tds gets to 1 0r 2 ppm
i add 2 cupfulls of resin, shake the vessel and it lasts another 6 weeks or so, depending on the amount of work
you do, in a way its similar to doubling up the vessels,  i have an open mind so will try anything that saves money,

[macmac]

You would still shake the vessels when required but do you see for just the expense of a second vessel (60 quid?) how much more economical this method is?

tony

[DASERVICES]

Joe,

Tony is correct, i know a couple of guys who use this method and get good use out of their resin. However they have been using Purolite in the past but now using Tulsion which is far better quality than Purolite.Probably the same quality as Dowex.

I have not used this method but will do in the future .

[Moderator David@stives]

I thought most resin was made at the same place, just put into different bags for different suppliers.


Dave

[pur]

Why are you using you'r DI vessles with no pre filtering?
No one with an RO would do that, wouldnt a filter system similar to a three or four stage like the RO in front of your DI and a slow flow make it last much MUCH longer.

pur

[williamx]

I use this method, and I am kepting a record of what usage I get from a 25 litre sack of resin.

On 5 september 2007 I filled 1 di tank with about 10 litres of resin, the other di tank has 15 litres of used resin with a tds reading of 10 ppm, my tap water is 72 ppm and I use around 1000 to 1200 litres of water a week

Normally with 1 di tank you would get 6944 litres of pure water per 25 litres of resin with a tap reading of 72 ppm before your tds reaging starts to climb.

Since the 5 september 2007 I have purified between 9000 and 10800 litres of water.

My tds reading is still showing 000 from the di tank that I filled with fresh resin.

So far I have produced 2056 to 3856 litres more pure water and I have only used 10 litres of resin and still have 15 litres more to use.

[Paul Coleman]

Why are you using you'r DI vessles with no pre filtering?
No one with an RO would do that, wouldnt a filter system similar to a three or four stage like the RO in front of your DI and a slow flow make it last much MUCH longer.

pur

You may have a point there.  I suppose the test would be to check the TDS from the tap and check again after the last pre-filter but before the first membrane.  If the TDS drops much after going through the pre-filters, then it may pay to have such a set-up in a DI only system.  If it doesn't drop - or only drops by a small margin - then it wouldn't be viable to have pre-filters on DI only.  Surely someone has already tried this?  I have an RO and will check this out sometime unless someone has already done it.

[jouk45]

i have never heard of tulsion resin before, like dave i thought they where all the same quality, i will buy a recondition vessel, and try this method out, thanks guys

[stoner]

i add 2 cupfulls of resin, shake the vessel and it lasts another 6 weeks or so, depending on the amount of work.

interesting point, i assume your using the bigger resin bottles.be interested to hear if anyone using a small ro man 1oo gpd system has tried topping up their resin container, or adding a secound one inline , and what the results are.im changing my resin every 600 gallons or so,although i do live in a hard water area.around 380 ppm.

[DASERVICES]

No, all brands are not the same , some perform better than others. It depends on the mix and mesh size. Will try add dig some data out.

[macmac]

Why are you using you'r DI vessles with no pre filtering?
No one with an RO would do that, wouldnt a filter system similar to a three or four stage like the RO in front of your DI and a slow flow make it last much MUCH longer.

pur

1. fill tank at full mains pressure, 400ltr approx 15 mins.
2. No waiting hours for pure water
3. No holding tank, transfere pump, booster pump etc.
4. Fill up from customers outside tap so never run out of water (providing they too have soft water & are not on a meter)

Pure water on demand, need i say more?

tony

[dai]

Using two in tandem is what I have done for the last 18 months, you have to keep a close eye on the TDS coming out of vessel one. I bin vessel one resin when it gets to 50 TDS, my tap water is around 55.
I have worked it out that it costs me £1 a day in resin costs. Dai

[macmac]

Using two in tandem is what I have done for the last 18 months, you have to keep a close eye on the TDS coming out of vessel one. I bin vessel one resin when it gets to 50 TDS, my tap water is around 55.
I have worked it out that it costs me £1 a day in resin costs. Dai

Don't know what brand of resin you use dai but my old-resin vessel has never got as high as 50ppm before the newer one needs changing. my tap tds is 96 & i use dowex resin

tony

[Captain Scarlet]

jouk, I use 2 di vessels and my system comes from window cleaning warehouse ( people who clean the millenium stadium and welsh assembley government! ) they know there stuff and it does last longer than just a single vessel, Luke

[DASERVICES]

In reply to my past comment this is what I received from the manufacturer.

"Tulsion resin is virgin, while that of other suppliers maybe used and regenerated. The mesh size and the ratio of Cation to anion does have an effect on the performance.  Tulsion resin is just rightly suited for the application and hence the better output."

This is not a reflection against all brands as some may be virgin.

I did a bit of research and found that Purolite is a regenerated resin, hence the reason why some find it not to last as long as other brands.

Hope this helps.

[windowwashers]

jouk, I use 2 di vessels and my system comes from window cleaning warehouse ( people who clean the millenium stadium and welsh assembley government! ) they know there stuff and it does last longer than just a single vessel, Luke

not trying to start an argument luke, but just because they clean millenium stadium and welsh assembley government ! does not mean they know there stuff it means they got the contract. I know window cleaning warehouse, but there cleaning contracts would not make me use them more or less, may impress some people 

[jouk45]

i thought all resin we bought was new (virgin) or so it should be, i  use purolite at the moment, but i can  assure you it will be tulsion from now on, we learn everyday