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That I don't know. In theory, the small pores in zeolite should trap finer particles, but the gaps between particles of zeolite sand are still large so behave more like regular sand in that regard. So the effectiveness depends on how well fine particles get into the pore openings and trapped vs. get around them. It also depends on how quickly such pores get filled up and how easily they are cleaned from a backwashing. I've heard mixed results on forums, but generally the filtration ability producing good water clarity is something most people say they see. The main problems seem to be with sand getting into the pool with some systems.
As far as NSF standards are concerned, zeolite is tested like sand. They do not run them through the more stringent DE tests. It would be good to try out the zeolite with a more difficult turbidity/particle test than that for sand, but something not quite as challenging as that used for DE. Such a test might also be reasonable for cartridge filters and for enhancers such as fiber clear.
Richard A. Falk said:
Richard,
Thank you for the ammonia information. How accurate are the claims on increased filtering ability over traditional sand?
James D. Roberts said:
The ammonia reduction touted by zeolite filter media manufacturers is irrelevant unless you let the chlorine level in the pool go to zero. The reason is that if there is any chlorine in the pool at all, it will very quickly combine with ammonia to form monochloramine in seconds long before any ammonia ever gets to the filter. The filter will not remove monochloramine and the equilibrium between monochloramine and a very tiny amount of ammonia is too slow. I figured this out from the chemistry, but this was also proven to be true in tests at NSF where there was no monochloramine reduction seen with zeolite.
I asked almost all of the zeolite manufacturers to stop making the "no ammonia, no chloramines" claims years ago since they are misleading (technically true, but irrelevant due to what I wrote above), but most still make such claims. I'll wait until NSF gets further along with their chloramine reduction test standards before going after this again (such standards will be useful for technology such as UV or ozone that actually reduces chloramines).
Don,
I couldn't give a hard and fast rule. But I have guys with glass over 7 years old and no issues on some pretty nasty loads. One retail location puts in about 50 a year. He likes to up-sell people when they come in with two massive crushed cartridges. "For a little more, we can get you a whole new filter that much easier to maintain and less headaches and no more crushed cartridges every time you forget to clean it - Cha Ching. Of course, as others have said, maintenance and service of filters is a money revenue for many on route work.
Don Parish said:
Scott Tarr said:
Don Parish said:
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