tbh,
I appreciate that you feel proud of your product and when it is working it does a good job. You should probably try contacting each of the people who have reported problems with it on this forum to see if you can figure out the root cause and address it (if you have not done so already). There are
43 Google pages of posts at TFP referring to ZeoSand so it is certainly popular and frequently discussed (with nearly 75,000 members and nearly half a million unique visitors per month to TFP during peak summer we get a reasonable base of reports for the more popular products).
The most common complaints about the ZeoSand are summed up in a couple of representative posts such as
Cloudy water and sediment with Zeosand,
this post about it working great when it works and not so much when it doesn't,
this post, another
Cloudy water and sediment with Zeosand, a service tech's impressions with Zeosand and regular sand in
this post and another in
this post,
A bit cloudy - Thinking I should slam, and many other posts and threads (you should go through the hundreds of posts to find the problem ones -- I don't have time to do that).
The vast majority of posts/threads don't refer to any problems and some service techs think it's great so I don't want to leave the wrong impression. We don't recommend against Zeosand (i.e. we don't say to never use it), we just don't recommend it over regular sand.
As has been noted in some of the threads, there are different qualities of zeolite so some manufacturer's brand might be better than another (see
this post and the subsequent one).
Finally, I wrote to "clino" and Pete Bunger in 2009 about chloramine reduction claims being misleading given the chemistry since zeolite does adsorb ammonia, but not monochloramine and as described in
this thread the monochloramine will get oxidized by chlorine much faster than any removal of monochloramine via equilibrium with a tiny amount of ammonia that gets adsorbed in the filter. As noted on your
current ZeoSand webpage, you no longer refer to reduction of chloramines (so thank you for changing that) but you do say the filter "Traps Ammonia" which is technically true, but irrelevant so is a bit misleading in a normal pool environment (i.e. one with chlorine). It would be most applicable in a situation where the chlorine went to zero and one had a bacterial conversion of CYA to ammonia though would require a lot of recharging in that case.