good grief! zeolite absorbs NH3 and NO2, yes, but not indefinitely. after a while it has to be recharged by emmersion in a salt bath. It DOES not absorb NO3. Happy recharging then every few weeks/days. good that you are still changing H2O, but why rely on zeolite if you have plants in the 1st place? If your tank setup is healthy, let the nitrifying bacteria do the NH3>>NO2>>NO3>>plant absorption conversion.
Bookmarks