No, the haze does not have to form for polyclar to work.
Polyclar removes the tannin portion of the complex between tannins and protiens that forms cold break - it works at any temperature you care to name. It seems to work faster in cold beer... But that's for when you need a contact time in the minutes, if for instance you are a big brewery dosing the stuff inline to a filter.
If you give it more time than a minute or two... Like 10 or 15, or an hour... Then it still works perfectly well. As demonstrated by polyclar brewbrite, where the pvpp portion is admirabhly able to do it's job in a kettle full of boiling wort.
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