Boomer: I don't know enough about Hyperlube to tell you what exactly happens to it. All I know is that it's used as an anti-corrosive agent. If it has any properties to prevent algae, it's a bonus.
So if you have a mixed metal loop, specifically with aluminium and copper, you must use one.
tdloc: We don't know the nature of the build up, but it's a very thin slime that coats the inside of a loop. Airspirit found a way to clean it though.
The quantity you're using is OK. WW is supposed to be mixed at 4%. WW contains a surfactant, which can make the water bubble/foam. This goes back to a well designed airtrap, more than the surfactant though. In your case, the WW is optional. Without it, the copper will slowly tarnish over time, which you'll have to acid clean (vinegar) once in a while. The anti-corrosion would slow down that effect.
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