My pool is cleaned with a copper ionizer. The readings for copper and pH are always good. How can I be sure there is no unhealthy bacteria
Even with a copper ionizer system it is a good idea to maintain a low level of chlorine or bromine in order to prevent any unhealthy bacteria. You can typically maintain a lower level of chlorine or bromine because the copper is taking on some of the sanitizer workload, but you should at least have some low level present.
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