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Old 20-06-2018, 08:59 AM   #1
Imperialjim
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DI vessel life

What lifespan are you getting from your DI vessels?

I have recently bought a 11L with MB115. I have used it only as a final rinse stage 4 times and the readings are already starting to creep up to between 10-70ppm (it was 0ppm beforehand) depending on how quickly I put the water through.

I understand that it is all highly dependant on the water in my area (~400ppm) and how much I use it, but would've expected more than 4 rinses out of it?!
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Old 20-06-2018, 09:02 AM   #2
LeeH
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DI vessel life

Connect it in reverse and flush it through.

Keep the flow low and be frugal.




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Old 20-06-2018, 09:07 AM   #3
Imperialjim
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Tried that along with rolling it to mix up the resin. Didn't help much.

Based on reading older threads I would've expected more than 4 last stage rinses though?
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Old 20-06-2018, 09:29 AM   #4
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Yes, I have around 350 ppm down to 5 ppm and have done quite a few. But I donít keep count.

I do use a dedicated hose so get no losses swapping hoses. Not that explains your 4 washes.


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Old 20-06-2018, 12:50 PM   #5
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Several reasons:
1. Is it connected the right way round? The black head is moulded with IN and OUT.
2. How long does it run per rinse ? You should be able to do an average car in a minute.
3. Is the pipe inside a snug fit ? Is it cracked ? Is it in situ even ?
4. Is the vessel full of resin?

If your readings are that variable, then whatever you are measuring it in (cup, glass?) probably has some tap water residue in it. Giving it a good rinse out with filter output water first should give consistent figures.

The dumpier 11L vessels are not as efficient as taller thinner ones like our 7L one (and even more efficient 14L vessel) but you should do better than that. Your supplier should help you on this, we always get to the bottom of any issues for our customers.
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Old 21-06-2018, 08:50 AM   #6
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Thanks for the response Mark (this isn't one of yours as you've probably surmised based on the size).

Quote:
1. Is it connected the right way round? The black head is moulded with IN and OUT.
Yes, I checked this and tried the backswill trick. I dissembled the head and the inlet goes into an outer cavity that feeds into the top of the vessel, the OUT pulls up through the tube in the centre.

Quote:
2. How long does it run per rinse ? You should be able to do an average car in a minute.
I used it longer than normal I would say, but even if I went pessimistic and equated it to 8 'normal' rinses seems a pretty poor return.

Quote:
3. Is the pipe inside a snug fit ? Is it cracked ? Is it in situ even ?
Pipe seems to be snug in its seat in the head, I did get slightly improved readings after I took it apart and then back together again. I can't see any cracks but didn't actually test for them, I will do tonight.

Quote:
4. Is the vessel full of resin?
No, when I opened it up and took out the head and tube I'd say it was only 2/3 full of resin (full with water at the time). Dissappointing.

Quote:
If your readings are that variable, then whatever you are measuring it in (cup, glass?) probably has some tap water residue in it. Giving it a good rinse out with filter output water first should give consistent figures.
That reading variation is dependent on how quickly I run water through it; at almost a trickle it gets down to 10ppm, at tap fully open it goes up to 60ppm.

Quote:
The dumpier 11L vessels are not as efficient as taller thinner ones like our 7L one (and even more efficient 14L vessel) but you should do better than that. Your supplier should help you on this, we always get to the bottom of any issues for our customers.
I'm in contact with the supplier, their responses have been a bit average so far, they are basically saying that the resin has expired (possible) or that it is "damaged" as I ran water through too fast (I don't buy this as I haven't even used a PW). They did suggest checking the tube is seated correctly though. I'm going to write up what I've said above and see what they say.
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Old 21-06-2018, 12:01 PM   #7
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Far be it for me to comment on another suppliers customer support, but as you're not receiving much, here goes:
The vessel is underfilled by rather a lot.
The flow rate wont make any difference to media performance at normal mains pressure.
The tube should fit snugly into the bottom locator which sits on the base of the vessel, and poke no more than 1cm proud of the rim of the vessel with the top off.

Resin may have expired but I think that's rather doubtful, assuming it was good resin in the first place. Good luck with your helpful supplier.
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Old 21-06-2018, 08:03 PM   #8
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I have a 15.4lt vessel, I get between 15 and 18 months between resin refills. And it gets frequent use for final rinse and washer bottle refilling etc. My water pre filter is around 340 ppm. Biggest giveaway at spent resin is when it starts to smell really fishy.
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Old 22-06-2018, 09:21 AM   #9
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Iíve a similar 11litre vessel. My ppm is between 200 - 250. Iíve stopped using it straight from the tap as it doesnít last at all. I now fill up an IBC tank. Recently Iíve 2/3 filled my vessel and got just over 500 litres from the resin at an extremely slow flow rate. After 100 litres the ppm started to go up and it took a lot of watching and rolling to keep it less than 5.

For info Iím pretty sure thereís a lot more to it than mere ppm total and trying to calculate the litres you get from your base ppm level just doesnít work.

But 4 rinses even if you were using 20 litres a rinse does seem excessive for resin to be completely shot. Iíve seen my ppm number stick at 50 then Iíve left it a day and tried again and itís back at 2 for another 150 litres if I keep the flow rate down.

If I put my tap on full the ppm shoots up so definitely keep the flow rate very low.


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Old 22-06-2018, 12:32 PM   #10
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Despite what other have posted, flow rate is VERY important.

The ion exchange resins work on contact time with the water. The longer the contact time, the better the efficiency of the DI vessel.

Slower flows will produce better results (until of course the resin is fully exhausted, by giving up all its ions in the ion exchange transfer process).
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