A filter pump does not kill bacteria — it removes physical debris like dirt, leaves, and hair by circulating water through a filter, but it doesn't sanitize the water or eliminate microorganisms like bacteria, viruses, or algae.

To keep water hygienic, you need additional sanitation, such as:

Chlorine or bromine (chemical disinfectants)

Oxidizer

Saltwater systems (generate chlorine naturally) (possible when adding a liner)

Ozone or UV sanitizers (kill bacteria without chemicals)

Best setup:

Use a filter pump + ozone cleaner

The pump keeps water moving and clear, while the sanitizer keeps it safe and bacteria-free.