Loop was flushed on 28 or 29th of August, 2015, with almost 1 gallon of 5% distilled vinegar, followed by 1 and 1/2 gallon of distilled water till flushed water was clear. 12 drops of PT Nuke Phn (Benzalkonium Chloride) added to as bio-cide and corrosion limiter.
Flushed vinegar became bluer and bluer, with a deep blue green before flushing with distilled water.
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