Biofine is intended to be used in cold beer where it is mixed in well. Pro breweries typically use it in line, in a hop back or similar vessel while they are transferring from fermenter to brite tank so that it mixes well. The way I found works the best at the Homebrew level is to use it in a secondary fermenter or keg with close transfer capabilities.
Use the typical process of liquid purging the secondary vessel. when purged, measure out the biofine in a syringe. Then you're going to start unscrewing the pressure relief valve. When your close to unscrewing it all the way, connect the co2 line to your gas bulkhead with low psi and then completely unscrew the prv. Then use the syringe to push the biofine into the keg/fv. Once in, let the gas run for a 10 second to prevent as much o2 from entering as possible. Then screw the prv back in.
After that you’ll close transfer as normal and rock the keg/secondary back and forth a few times to makes sure it’s completely mixed in. After that crash it and wait 3-5 days. After that you’ll be left with crystal clear beer.
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