A friend of mine and I decided to brew my pre prohibition pils which uses 30 percent rice and 6-row malt. I've never had a problem on my system but I didn't know he had a bazooka T under his false bottom! Well the T clogged up and we had to dump the mash into a cooler and take the T out but leaving the false bottom. We returned the wort and started our mash again and had no more problems. Recirculation or Vorlaufing will clear your wort better than any screen will. If you're doing a beer with adjucts, wheat, oats or rye you might want to leave the screens out of the loop.