Several folks use this method with good results.
Cold crash your beer until it is below 50 degrees.
1/2 tsp Knox gelatin (any unflavored gelatin should work) BTW gelatin has a positive charge
1/4 cup cool water
Add the gelatin to the water stir and then microwave in seven second bursts, stiring between burst until the liquid reaches 145-150 degrees. Add the mixture to your beer. Continue chilling your beer to near 32 degrees and allow it to sit for 24-36 hours.