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How to stop rust in metal water barrels?

 
Posts: 9
Location: Olympia, Washington
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Greetings,

Not sure if this is the proper subforum but here goes.

I am attemnpting to heat and cool my greenhouse using 3 55 gallon black metal drums connected together and cycling through a radiator with a fan behind it. Similar to https://northernhomestead.com/car-radiator-for-heating-and-cooling-a-greenhouse/

The problem is its producing a ton of rush. Any ideas on how to treat the rust or stop it, or am I doomed to have them rust out? I went with metal as it absorbs the heat from the sun much better than plastic.

Thank you,
 
Rocket Scientist
Posts: 4299
Location: latitude 47 N.W. montana zone 6A
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Hi Brent;
I am not aware of any product to stop rust forming. I could be wrong.
I think you should expect these barrels to be good for a few years.
Long enough to see if they do the job for you.
At that time I would replace them with the plastic barrels.  I would think a black plastic barrel  would do almost as well as the metal ones.

I run a micro hydro. The first 5-8 years I used several metal barrels as my water dump. About 2-3 years before they rotted thru.
In the 20 years since then I have bought one plastic barrel and it is still as good as the day I bought it...
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Location: Texarkana area.
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are you opposed to using a Polyethylene Plastic drum liner?

https://www.mcmaster.com/9772T29/
 
pollinator
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Location: North central Ontario
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You could use a corrosion inhibitor like they do for outdoor furnaces... something like this one. https://altheatsupply.com/wood-furnace-parts-accessories/maintainance-treatment/inhibitors-rust-scale.html
 
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