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Old 03-01-2018, 01:40 PM   #1
smk82
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DI Resin/drying towel questions

I just recently replaced my DI resin in my 11 litre vessel (it had lasted me about 18 months before starting to creep up to ~30ppm, so time to change).Order some Tulsion MB-115 resin (struggled to find some in stock in December, but persevered), and replaced. First time I came to use it last weekend, I had the tap connected up and ran it through the vessel for a good 5 mins keeping an eye with my TDS meter, before I started rinsing the car, but the water didn't appear to drop below about 20ppm? (Previously when I've changed resin its been down to 0ppm).

So I'm wondering if

1. the TDS require any kind of calibration post battery change i.e. false reading?
2. does the resin require a longer period to work properly, or have I had the water pressure up too high so its gouged a channel through the resin rather than filtering to allow for efficient ion exchange?

Finally - when I was using my new woolly mammoth drying towel and pat drying post rinse, noted that the car wasn't completely dry after removing the towel (still some damp smears remaining)... and I did wash the towel prior to first use.

Any thoughts would be helpful...
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Old 03-01-2018, 01:49 PM   #2
fatdazza
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Are you sure you bought mb115? Some unscrupulous sellers that sell it in less than the standard 25 litre bags sell inferior resin.

Try lowering the pressure and giving the vessel a roll to close any short circuit pathways.

Buy a bottle of di water to test your meter at zero.

Damp smears are ok. One you have done the whole car a quick’ spritz with a qd and plush mf will finish it a treat.

Also with a di vessel you could leave to drip dry (as long as your vessel is good)

Last edited by fatdazza; 03-01-2018 at 01:51 PM.
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Old 03-01-2018, 01:51 PM   #3
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that's what it was sold as/labelled as, so I had assumed as such. I will give the vessel a roll and see if that makes a difference.
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Old 03-01-2018, 01:52 PM   #4
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this was the place/stuff I bought... worked out cheaper than buying 25L and having stuff sit in my garage for 18 months or so

http://thecleaningwarehouse.co.uk/tu...ock-1300-p.asp
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Old 03-01-2018, 02:01 PM   #5
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Quote:
Originally Posted by smk82 View Post
this was the place/stuff I bought... worked out cheaper than buying 25L and having stuff sit in my garage for 18 months or so

http://thecleaningwarehouse.co.uk/tu...ock-1300-p.asp
No reason to doubt the supplier, but interesting that the 25 litre bag is sold as

"Tulsion 115 Mixed Bed DI Resin 25l"

and the smaller portions are labelled

"Tulsion Virgin Mixed Bed DI Resin 5L"
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Old 04-01-2018, 11:59 AM   #6
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Note that resin has a shelf life of around 2 years, so is there a date on the bag ?

It also deteriorates in contact with the air - was it sealed ?
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