the algea don't form a big problem for me. i add a little radiator protector stuff (not waterwetter, is very hard to come by) a few drops of dishwashing stuff (swiftech states that to be good to decrease water surface tension), and some bleech. maybe that isn't too good for my temps, but i'm not noticing it anyway. some of my tubes are xposed to light, and after 3 months no sign of green stuff.
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