Well I finally got some Perlite and did some filter runs with it and so far the results have been lousy. First some details, Im using a small 2 meter horizontal leaf dosing filter. I filter between 10-30 Bbl per run. Normally I use Standard DE and Cellulose for a precoat and then Hyflo DE for body feed or Standard on the Lighter beers. The Perlite I aquired was grade 7 which I was told was very close to Standard Grade DE as far as micron rating and performance. I initially only used the perlite for dosing and didn't notice much difference. Then I tried a light beer with a Perlite and cellulose precoat and perlite body feed. The beer was nearly clear to start with and the filtration went smooth but I ended up with some haze. That beer had 25% corn and I had never used corn so I figured that might be it. Next I did another filter with all Perlite except for a bit of cellulose in the precoat, this beer had 25% wheat and after 1 BBl the outflow looked identical to the inflow and I had to break down the filter and set up again with DE. Today I filtered what is normally my easiest beer an I used equal parts DE and perlite in the precoat and perlite only in the body feed and the beer was clear but the pressure rose unusually fast. I noticed that when using Perlite only that the precoat never seemed to set as nice and never ran completely clear, also when I broke down the filter it seemed the edges of the plates had not been coated well. I have heard great things and some bad things about Perlite and I am now firmly in the not so good camp. Any ideas from successful perlite users?
"You are what you is." FZ