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The bowl and the tank must be disinfected after cleaning by adding bleach. The bleach must be allowed to sit for at least one-half hour. This procedure may have to be repeated several times. It is important that all areas with fungal growth be treated at the same time to eliminate cross contamination.
The presence of fungi in the toilet bowl should not be interpreted as a problem with the drinking water quality. It is very similar to leaving a piece of moist bread on the kitchen counter, sooner or later it will support mold growth. This does not mean the bread was bad, only that when it was left open to the environment it will support growth.
Routine cleaning will not eliminate this organism. Cleaning must be followed by disinfection using a bleach water mixture. All areas must be disinfected to reduce the chance of growth. Serratia will not survive in chlorinated drinking water.