I use zeolite (don't remember the exact brand, not that it matters) as my filter media too. I have a brand new 1/2hp pump, 19" filter, and I also get a puff of cloudiness about 2-3 seconds after the pump is turned back on. The cloudy water comes out for about 5 seconds or so and doesn't get trapped when I put a skimmer sock in front of the return.

I had the same issues with my previous filter (which was also brand new) using Zeosand.

I now second guess my decision to use this media. I bet if I would have gone with just good 'ol sand I wouldn't have the problem.