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Acidic water

post #1 of 6
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Greetings, persons. So, my 7970 died, and while i await for a new/repaired one, i thought i'd mod my case and improve my custom loop. I had been running nothing but feser's ultra pure water with a silver coil in the res. I had thought all along it was as distilled as water can be, but i came across some posts stating it was, in fact, acidic, and, thus, corrosive. Under this light, i searched for the product's specs on their site, and it's stated that its pH is between 2 and 3. Also, i checked the inner copper of my hf supreme, and its color is slightly changed (a mix of very dark green and brown). However, when i drained the loop, the water was crystal clear and it had no debris. In the meantime, i've changed the rad and tubing, while the res, pump, and cpu block remain the same.

With all that said, did i really run acidic water for 3 months, and, if so, should i just flush the entire loop and be done with it, or would it be better to just get everything new and run a new loop with simple distilled water and silver?
    
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post #2 of 6
Somebody's selling something called "pure water" with a pH between lemon juice and vinegar? That's insane. Actual pure water is defined as pH 7.
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post #3 of 6
Quote:
Originally Posted by threephi View Post

Somebody's selling something called "pure water" with a pH between lemon juice and vinegar? That's insane. Actual pure water is defined as pH 7.

^this they sent you acetone in a water bottle
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post #4 of 6
Yes, I just looked up the MSDS from Fesser's site and they specify it has a pH of 2.0-3.0, which is just plain bizzare. Distilled water is always slightly acidic as it absorbs CO2 from the atmosphere and forms a very weak carbonic acid, but that isn't going to drop the pH much below 5-6 at most.

I'm very perplexed as to why they would either claim a low pH or make a fluid with said low pH.

Either way the darkening that you are seeing on the copper sounds like normal tarnish, it does not measurably hurt performance. You should be able to remove it with lemon juice / ketchup and a gentle scrubbing, just be sure to keep your o-rings and any acrylic parts out of the way.

I would keep running the same kit with some store bought distilled, it will be fine.

Edit: pH 5-6, not 5.6
Edited by GingerJohn - 2/28/12 at 2:17pm
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post #5 of 6
I wonder if that ph 2-3 is a typo, or just someone at their company who doesnt know that you cant use a PH meter to read ultrapure water. There is not enough conductivity for the sensor to work properly, and you will get erroneous results. So have to measure resistivity and calculate, or use a PH meter based on such, ie one specifically designed for ultra pure water.

Like GingerJohn said, pure water can get PH 5 and not much below from dissolved C02, and most in 5-7 range, but PH 2-3 is typo, wrong reading, or adding acid. But I wouldnt put anything in my loop that was advertised as such.
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post #6 of 6
Thread Starter 
I thought it was weird, too, that it's supposedly very corrosive and, yet, water came out crystal clear. So, i decided to compare the reaction between baking soda and these 4: tap water, distilled water, feser's aqua, and vinagre. The result? Feser's aqua does not chemically react with baking soda, and the result was the same for both tap and distilled water. Vinagre was, as expected, extremely reactive, and was just there to serve as comparison. So, given this, i decided to use the same loop (well, block and pump, at least), and dipped the copper in lemon juice. It's pretty clean, now. 'Twas a load off my mind!

And, yes, i am going to use store bought distilled, now.
Edited by ToTheSun! - 2/28/12 at 2:08pm
    
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