Isopropanol. Add 1-2 tablespoons per Liter of water. Toss in a cup of sugar, 2 tsp of vanilla, and 1 bag Toll House chocolate chips ... oh, sorry. For corrosion protection, you need water wetter, hyperlube, or purple ice. For algae/bug use alone, you can use rubbing alcohol/isopropanol. Sorry, but I think in a system with dissimilar metals (Cu/Al), you're better off spending the ten bucks and saving yourself the grief of reboring your block and unplugging your radiator. You either spend money on the additive or you spend it on the repairs (possibly of your system when the block ends up plugged): you make the call. Nobody said that running a decent WC system was free. Alcohol of any type (meth-/eth-/isoprop- anol) will NOT protect you from corrosion.
(No flame intended, just stating my observations).
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#!/bin/sh {who;} {last;} {pause;} {grep;} {touch;} {unzip;} mount /dev/girl -t {wet;} {fsck;} {fsck;} {fsck;} {fsck;} echo yes yes yes {yes;} umount {/dev/girl;zip;} rm -rf {wet.spot;} {sleep;} finger: permission denied
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