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I know of no reason to use PP other than treatment of confirmed infection by trichodina. ...none. Dangerous stuff that, at best, disrupts the natural biofilm/algal communities that define a 'mature' pond. Justifying use on the basis that no harm was observed, or that a mature biofilm can endure if done 'properly', is simply closing one's eyes to the known reality. It is rather like an alcoholic observing that his liver has not ceased to function... yet.
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