Well, since my posting, I have found a laumontite supplier out in California. The company is Zeo-Tech, Inc. Anyway, Laumontite seems to work about as well as clinoptilolite, which I got from St. Cloud Mining Co. in New Mexico. These things work great for my process, all except for they also leach metals into the stream, which has it's own set of problems. To rectify this, I use a secondary cation exchange bed to remove the metals. But Na, and K are tougher to remove, so I was searching for a Ca rich zeolite. Anyway, that's part of the background. What I am trying to do is remove a soluble cationic polymer from our process fluid to recycle it. The polymer cannot be removed with normal cation exchange beads because they prefer to catalyze a side esterification reaction. So zeolites seem to be a workable option. Another problem I'm dealing with here is that I cannot find a 100-200 mesh size. My suppliers deal in 40 mesh and 325 mesh. The 40 mesh have too low an outer surface area, and the 325 mesh prevents flow. So our working option for this polymer removal seems to be a slurry reactor. Any other suggestions?