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My reservoir water level is slowly shrinking - Page 2

post #11 of 21
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Quote:
Originally Posted by Caleal View Post
Not just possible, it is a fact.
It is a slow process, but the Tygon, and other brands, of tubing we use in WC actually absorbs a small amount of water from inside the loop. It then evaporates from the outer walls of the tubing.
The more tubing in your loop, the more noticeable it is over time.
Heat and pressure also speeds up the process.
A system like mine with 2 series DDC pumps in a long loop, CPU + 2xGPU folding 24/7 in relatively high ambient temperatures, will loose water much faster than a CPU only loop that is only on part of the day.

If you want completely non permeable tubing, you need something besides flexible PVC tubing.

The really noticeable drop in water level in the first couple of days or weeks of running is most likely air bubbles making their way to the reservoir though.
Sounds like my system so I guess I'm safe. I'll just have to refill every once in a while if it gets too low.
post #12 of 21
Here.

I'm joking
post #13 of 21
the water in my reservoir slowly shrinks too, I always just thought it was evaporation as others have mentioned. I just fill'er up once in a while
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Bawwwww
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post #14 of 21
Quote:
Originally Posted by kiwiasian View Post
Wouldn't that take an extremely long time.
Yes, but it is just one more factor leading up to this. Right now, it is shrinking because of air bubbles primarily.
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post #15 of 21
I remember having to add water into my loop like every two weeks. Then I removed one of those fancy / budget busting / bling bling / see thru / mount it horizontally or vertically / cylindric res I had in my loop and the evaporation phenomenon disappeared (using Tygon R3603 as well). And didn't add any distilled water ever since... (and I removed that res like at least 8 months ago if not more...)
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post #16 of 21
If you have distilled only, add some market approved dye.
Wrap white paper napkins all over your fittings. If after a day no stains will be visible on paper, there is no critical leak.
Also highly likely you got air stuck somewhere. It happens.Give it some time.

Water vaporizing over tube walls is a myth untill someone proves it
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post #17 of 21
Quote:
Originally Posted by DirectOverkill View Post
If you have distilled only, add some market approved dye.
Wrap white paper napkins all over your fittings. If after a day no stains will be visible on paper, there is no critical leak.
Also highly likely you got air stuck somewhere. It happens.Give it some time.

Water vaporizing over tube walls is a myth untill someone proves it
I did prove it for a science lab in high school. The experiment was PVC tubing evaporation. I decided to do the lab for this very reason, to prove that water can evaporate through PVC tubing. LOL
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post #18 of 21
What are you waiting for? Post it! Give us a twist
At what temperature did is start to occur? What were the time related losses in %?
I am curious
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post #19 of 21
All tubing we typically use is porous, but the loss from evaporation would only be few mm's from reservoir over many months. OP is most likely bleeding air, if has no leak. One way to check for air is look at water level with pump on vs pump off, air is compressible, water is not. So if fluid goes down with pump on, may have as much as 2x volume change in air.

Tygon lists water absorption specs of some of their tubing. Neoprene will lose almost no liquid over time, tygon also makes some tubing with specially coated bore that resists (not impervious to) liquid penetration, but it is expensive and stiff, but does have a lower volume/weight % water absorption and subsequent evaporation, specs for such tygon tubing listed at end chart here.
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post #20 of 21
Quote:
Originally Posted by DirectOverkill View Post
What are you waiting for? Post it! Give us a twist
At what temperature did is start to occur? What were the time related losses in %?
I am curious
Oh, jeez. It's probably at the bottom of a pile in the attic. But I'll look for it JUST for you
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