It's a fining agent. I don't know the science but I know it does work.
When adding, keep good sanitary practice, add at a temperature similar to the wort, wait a few days to clear.
As fuggled said, day 6 is a bit early to judge clarity. Even bottling day can be too early. Conditioning in the bottle for a fortnight, then a day or two chilling in the fridge will improve clarity further.
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