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Help determining why water flow has steadily decreased by 12% since finishing the build?

post #1 of 31
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When I first built my rig, my Aqua Computer flow meter (using the Aquaero 5) registered the initial flow rate at 297-305 liters an hour about 2 weeks ago. Approximately 10 days ago, the rate was 289-294 LPH, 7 days ago it was 278-281, 4 days ago it was 271-274, and today its 266-268.5. I don't have any leaks and havent adjusted anything. My reservoir did drop about 200ML the first week and I topped it off about 3 days ago, but I assume this was just air being worked out of the the system. My CPU temps and water temps don't seem to be impacted by this change, but I am still running the CPU at stock speeds.

Unless this is due to an metering failure or air initially in the system contributing to a false reading, I can't figure out what would cause a 12%+ loss in water flow.

Any ideas?
    
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post #2 of 31
Your water might be evaporating, though I don't see this causing a lack of flow...

The only thing I can see causing a 12% flow are the following:
A) Your PSU is weak. If you've overclocked anything, this could have pushed it to its limit and its rails are suffering.
B) Could be a metering fail.
C) The air in the system wouldn't cause the flow to go faster, thus causing a misread. the only way the air could have caused a misread is if air pockets / bubbles were directly around the sensor..which seems improbable.
D) Pump has been broken in. I don't know why it would cause a decrease.
E) Could be a blockage somewhere... block, rad, tubing... could be sediment from dyes or some crazy kind of algae. You never know rolleyes.gif


Just wait another week and see what happens. If your flow keeps dropping THEN there is something.
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post #3 of 31
200ml "loss" in a week? That's 1/3rd the liquid in my entire loop!

Regarding your flow, not sure. You shouldn't have any sort of buildup in the blocks at this point. If I'm reading your system right, are you only cooling your cpu?
 
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post #4 of 31
Probably due to friction caused by build up in the tubing and blocks
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post #5 of 31
possible:

there is some sludge at wb,
weaker pump.
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post #6 of 31
Thread Starter 
Quote:
Originally Posted by dmanstasiu View Post

Your water might be evaporating, though I don't see this causing a lack of flow...
The only thing I can see causing a 12% flow are the following:
A) Your PSU is weak. If you've overclocked anything, this could have pushed it to its limit and its rails are suffering.
B) Could be a metering fail.
C) The air in the system wouldn't cause the flow to go faster, thus causing a misread. the only way the air could have caused a misread is if air pockets / bubbles were directly around the sensor..which seems improbable.
D) Pump has been broken in. I don't know why it would cause a decrease.
E) Could be a blockage somewhere... block, rad, tubing... could be sediment from dyes or some crazy kind of algae. You never know rolleyes.gif
Just wait another week and see what happens. If your flow keeps dropping THEN there is something.

Thanks for the input, here is some more info:
A) I have a 1000 watt PSU, but I am powering 2 MCP655 pumps, 8 SATA drives, 1 SATA Bluray drive, LED lighting, as well as 14 fans (through the fan controller) from only three PSU cables with multiple molex or SATA power connections. I hear the PSU exhibit a high pitched whine when all SATA drives are spinning up or many are working simultaneously (raid1). I've considering adding a modular PCIE to molex adapter to split the draw up, but seeing as my UPS reads only 0.260 - 0.298 kw output, it seems hard to believe that this would be needed?
E) No dyes, I have two kill coils (one in each res), I've looked at the tubing and I cant see any angles that would cause a blockage, but who knows about the internals. I did wash the rad out quite well before use and I've flushed the entire system 3 or 4 times during the build, as I redesigned the loop quite a few times.

I dont know if it matters, but my rad water temp consistently reads lower than both ambient and external case temps. However I see no sign of condensation, so the water sensors may just need some calibration.
    
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post #7 of 31
Thread Starter 
Quote:
Originally Posted by Angrybutcher View Post

200ml "loss" in a week? That's 1/3rd the liquid in my entire loop!
Regarding your flow, not sure. You shouldn't have any sort of buildup in the blocks at this point. If I'm reading your system right, are you only cooling your cpu?

Cooling the CPU and the Aquaero 5 controller. I have quite a bit of tubing due to the size of the case, but no extremely tight bends. I have 2x400ml res, but I did lose about half of one res the first week, I assume while air was working its way out. The res's and pumps are in serial, which is why only the second res exhibited the large loss. When I shut down the system, they equalized again, just lower than initial fill points. I don't know much about water cooling, but I'm not sure what could build up in such a short period of time.
Quote:
Originally Posted by Raul-7 View Post

Probably due to friction caused by build up in the tubing and blocks

Build up of what though? with 2 kill coils and not a lot of light, I cant imagine algae is an issue and I flushed the rad well. Any idea where build up might come from and the best resolution?
Quote:
Originally Posted by dennos View Post

possible:
there is some sludge at wb,
weaker pump.

I have one variable and one non variable speed MCP655, the variable is set to speed 5, which is supposed to be identical to the non variable version. Of course, one pump could be failing slowly.
    
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post #8 of 31
i thought the non-variable pump was set to 4.
after looking at swift techs site p4 is the highest setting the MCP655-b will do so it will be slower than the MCP655 with speed controller that can be set to p5
Edited by IrishV8 - 1/20/12 at 1:24am
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post #9 of 31
If your PSU is whining, then you DO have a problem.
The reason is that when your computer starts up, the fans and HDD use considerably more power (5W idle, 30W startup, for example).
Its not only the wattage used by your PSU, but the watts most likely.
Some fans use 5W...
So 14 x 30 + 8 x 30 = 660W for just HDD+Fans.
Then your CPU, GPU, 2 pumps also draw their own power. And motherboard.

Try getting a kW reading RIGHT as your computer starts up. Just to give us an idea.

I could only see your pump dying as the last possible option...
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post #10 of 31
I'm betting that you have a growth problem in your loop or debris from the manufacturing process. What did you use to flush the components? I've seen systems with flushed components and only distilled have buildup within 72 hours that effected the temperatures in the system and by 96 hours were clogging blocks up. The safe thing to do is break the loop down and inspect each part. It will only take a few hours and give you peace of mind that everything is okay.
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