Originally posted by: Realguns
Actually you should use distilled water and some anti algae additive.
No they dont't need refueling so to speak just a tiopping off once a month or so kinda like checking your cars engine oil once a year or so.
All of the hoses lose coolant at a very slow rate so you just need to keep the level up once in a while.
You should not used deionized water as it will pull stuff from the blocks and tubes to become ionized again.
There are fluids avalable but the cheapest is distilled water from the grocery. I use this and 1 oz of antifreeze and run it for years with just 2 drops of "coolant system water leak detector*" to turn the water green under UV light.
*Does three things-
1. Its cheap at the autoparts store.
2. You can detect leaks under UV light-it designed purpose.
3. Its a gool green color.
Good Luck-
Thats me.