Its very long. It has all the typical arguments on new thoughts/ideas. If you don't feel like the entire read, do first 10 pages to see what its about, then jump to last 10. I'm going to use it. Gary has the best input in my opinion. On large systems it seems to be a good answer. Its for phosphate removal in swimming pools. Follow Gary's input/directions.
http://reefcentral.com/forums/showthread.php?t=1474839&highlight=lanthanum
http://reefcentral.com/forums/showthread.php?t=1474839&highlight=lanthanum