Sorry for not replying earlier. I've been busy trying to keep my job, care for my family and fit some brain-dead relaxation in there.
Now, I didn't see many unanswered questions in there except for your Algae Destroyer question. If it was me, I'd put in a half-teaspoon of bleach in your water to flush and clean it out (if you already had things growing in there). Then, I'd use distilled water (not De-ionized water, which is a waste of money for us) mixed with WW. If you are really concerned, put a half-teaspoon of bleach in your system and live with the fact that it might corrode your metal surfaces a small bit (plus it quickly evaporates out of the water if you have an open system).
People use all kinds of biocides: silver-based biocides, soap, chlorine bleach, anti-freeze, alcohols (I have seen people have use isopropyl, methanol, and ethanol), fish antibiotics and humidifier cleaners. I just recommend using distilled water and water wetter (see my article) with occasional flush and refill cycles (about every 6-months to a year). Most of the exotic biocides can either degrade performance and/or break down and coat your heat exchanging surfaces. If you start out clean and have a mildly basic (not neutral or acidic) coolant, you should be fine. Water wetter changes the pH to make things more inhospitable to biological growths.
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