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Monsters in water; need chemistry expert.

post #1 of 13
Thread Starter 
For people who like a story leading to my point:

So I built a window-unit water chiller a while back and in this chiller is a 4.8 gallon plexiglass tank that holds the liquid that is being chilled.

The liquid is roughly 70% distilled, 20% Ethylene Glycol anti-freeze, and 10% rainwater.
It's hard to seal since the unit is in the rain, but that's not what this thread is about!

I used to have a 50/50 distilled/anti-freeze mix but I had a leak and the stuff is relatively expensive so I just reused what I could salvage.

I noticed I have fuzzy stuff growing on the top of the water level and a few floaties. I have a filter so there are no solids getting near my water block but this still is gross.

Aluminum and copper sit inside of this tank as an evaporator coil is submerged in it, therefore I have mixed metals. I use the anti-freeze in hoping it will help with the situation and kill any growth.

I am probably going to end up putting a 75% anti-freeze mixture in the tank after cleaning it and add some type of biocide; now we're finally getting to the point of this thread!

For people who don't like a back story:

I have some condensate pan treatment tabs from an HVAC supply house and was wondering if the chemicals in it would cause any problems with my plexiglass, primochill tubing, water/anti-freeze mix, waterblock seals, orings, copper, aluminum, etc.

MSDS: http://www.nucalgon.com/assets/MSDS/English/4296-60.pdf
Page: http://www.nucalgon.com/products/IAQ_pantreat.htm

These are typically used in pans which are constantly being drained, my system is... relatively... closed(rainwater lol) therefore I will not be adding more every X amount of weeks as it will never leave the system.

P.S. If you guys think any other products these guys sell will help my situation, please tell.
If you find a miracle product on their website; I need corrosion inhibitors for mixed metal etc, biocide to keep the nasties out, and with all that it needs to be safe with every material it comes in contact with in my loop.

Edited by Khaotik55 - 8/12/11 at 1:39pm
post #2 of 13
Thread Starter 
post #3 of 13
Can't hurt to try them. There isn't anything in your system that will be harmed by them.

Just don't stick a couple in your shirt pocket and forget about them.
I did once, then my shirt got drenched with sweat while I was working. The resulting chemical burn on my chest was the most painful injury I've ever had, and I've been shot, stabbed, torn tendons, etc..

From the description of your system, you may be better off with the kind of chemicals used for treating cooling towers though.
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post #4 of 13
we want pics!
post #5 of 13
I have a similar setup,i bought 3 gallons of pre inhibited MEG off ebay then 1.5 gallons of distilled water.

[url]http://www.sciencelab.com/msds.php?msdsId=9927167[/url-
if pure,its freezing point is about as crap as antifreeze,but when diluted 30% the freezing point goes to around -60-70c
unfortunately it was costing me £30/gallon
but i am not freezing antifreeze any more
i wouldput some stockings/pantyhose? over the top of the res to catch the crap after giving it a proper clearout.
Edited by MightyMission - 8/13/11 at 1:22am
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post #6 of 13
Thread Starter 
Quote:
Originally Posted by Caleal View Post
Can't hurt to try them. There isn't anything in your system that will be harmed by them.

Just don't stick a couple in your shirt pocket and forget about them.
I did once, then my shirt got drenched with sweat while I was working. The resulting chemical burn on my chest was the most painful injury I've ever had, and I've been shot, stabbed, torn tendons, etc..

From the description of your system, you may be better off with the kind of chemicals used for treating cooling towers though.
I think I'll go ahead and try it.. what's the worst that could happen!?
..I fry everything on my motherboard.

Quote:
Originally Posted by shadow19935 View Post
we want pics!
I'll get em'.

Quote:
Originally Posted by MightyMission View Post
I have a similar setup,i bought 3 gallons of pre inhibited MEG off ebay then 1.5 gallons of distilled water.

[url]http://www.sciencelab.com/msds.php?msdsId=9927167[/url-
if pure,its freezing point is about as crap as antifreeze,but when diluted 30% the freezing point goes to around -60-70c
unfortunately it was costing me £30/gallon
but i am not freezing antifreeze any more
i wouldput some stockings/pantyhose? over the top of the res to catch the crap after giving it a proper clearout.
I don't think it's stuff falling in, I have the top covered with foil tape; I think it's just.. some really nasty stuff growing.
(Dude it has hair...)

Edit:


This res has everything it needs to grow some crawlers in it. Hot tropical weather when the unit is off, tons of sunlight, water contaminates. I'm not really surprised there's stuff in it I just need something hardcore to keep it out.
Edited by Khaotik55 - 8/13/11 at 1:45pm
post #7 of 13
Coolbox!
no light can penetrate and its insulated,will keep temps down when the chiller isnt on,
no offense but thats disgusting lol
cultivating your own ecosystem!
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post #8 of 13
H2SO4. Sulfuric Acid will do the trick!

Just kidding, I would consider flushing a few cups of pool-grade liquid chlorine through there. Sounds harsh on the equipment, but our A/C tech told us to do that monthly to kill algae growth in the condensate line.
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post #9 of 13
Getting some chlorine would work but then you need to monitor your filters and clean them out. There is also some stuff that is used for pools that are cloudy. It bonds to the small particles making larger clumps which can be picked up by the filter. So the procedure would be:

1 - Shock that thing with chlorine
2 - Clean Filters!!!
3 - Add the pool cleaner I was talking about that gets the small particles
4 - Clean Filters!!!
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post #10 of 13
Quote:
Originally Posted by VW_TDI_02 View Post
Getting some chlorine would work but then you need to monitor your filters and clean them out. There is also some stuff that is used for pools that are cloudy. It bonds to the small particles making larger clumps which can be picked up by the filter. So the procedure would be:

1 - Shock that thing with chlorine
2 - Clean Filters!!!
3 - Add the pool cleaner I was talking about that gets the small particles
4 - Clean Filters!!!
This^^^^

Or you could buy a chlorine tablet and put it in the resevoir. I doubt it would hurt anything and it would continually release chlorine into the water....

EDIT: Watch those filters! Keep them clean....
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