Treatment suggestions for water recirculating system.

[Dkirven]

I have an aluminum heat sink that uses water to keep the temperature near constant at ambient. I am removing about 5-10 watts from the sink. I am using a small circulating pump and a 50 gallon reservoir as a radiator. The heat sink is connected to the reservoir through a pair of 3/16" ID lines. This pump runs 24-7. The small pump is in the reservoir and the return line is above the water lever in the reservoir so one can see water flow. It also keeps the water absorbing air to reduce anaerobic bacteria. I want to treat the water but I am afraid if I use bleach it will corrode the aluminum heat sink. I had a 25% mixture of polypropylene glycol for a similar project and it worked well, However, I cannot find it at the local big box store any more. Does any one have a good idea for a cost effective solution to treat the water? Currently the water is flowing but it is "stinky".

 

[HVAC-Novice]

Ask an HVAC treatment company what they recommend. Since you have an open system, you will need much more than for a closed loop system.

Modern cars (and few boilers) have aluminum HX. So yes, it can be done. but you need to account for all conditions including other metals in touch with the water, and the fact it is open and gets oxygen all the time.

 

[LittleInch]

Try looking at aquarium water treatment?

Possibly add a UV filter?

Be careful you're not getting into Legionnaires territory.

What temperature does your tank get to?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[nuuvox000]

I'll just confirm, bleach is bad for aluminum.

https://www.calpaclab.com/aluminum-chemical-compatibility-chart/