You should be cleaning your tubing periodically. I am using the following:
70% distilled, 20% red glycol, 5% hyperlube, 5% sanitizer. I have no bacterial growth in over 80-100ft of tubing and piping, and I have absolutely no corrosion. Further, there is no film on my tubing at this time. In a smaller system, use less sanitizer/glycol and more hyperlube and you'll be fine. Remember, that stuff in my system lived through ALCOHOL ... I don't think any additive other than the *sol enema would kill that stuff.
Hyperlube is my preferred additive, along with other protections.
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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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