Quote:
Originally Posted by Etacovda
"However, where I live algae/fungus/bacteria (general growth in water) are a major concern."
buy some distilled water, it cheap.
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I had planed on using distiled water, but it may still be an issue because of the air quality/average temperature around my local.
Quote:
Originally Posted by Brians256
Soap is just going to make bubbles. I recommend against it. Temps really aren't going to change much by using a surfactant. I just don't like foam in my reservoir. Hard to get the bubbles out.
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Noted, though, I don't believe I would be using enough to cause it to foam up.
Quote:
Originally Posted by Brians256
I use a combination of distilled water, and antifreeze. Then, I change the water every 6-12 months and flush the system. That prevents corrosion and bio buildup. So far... 
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Something I just remembered.....my city sucks.
In the city I live in it is unlawful to dispose of or accept used anti-freeze except at city authorised locals.
There is only one city authorised local. The recycleing center, but they only accpet anti-freeze on the first and third Tuesdays of odd numbered months.
Which is a PITA and ridiculous for a city of 150k people, it makes me so

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So whatever I get needs to be something anti-corrosive, something anti-growth, and something I can pour down the drain or easily dispose.