Best low maintenance coolant for a custom loop.

[Caring1]

As the title says, I would like to know what others think is the best brand to use for coolants.
I'm not worried about colour staining on clear hoses, but I would like to avoid gunk in the system, while doing minimal work on it.

 

[londiste]

For starters steer clear of anything that has colour
The simplest one from each brand is probably the way to go - distilled water + anticorrosion + antibiotic agents and nothing extra.

 

[ir_cow]

Distilled water. Never needed anything else. Drain once a year. Cost $1.50 for a gallon at the store.