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Unfortunately I could only open this link: https://files.knowledgepoint.org/uploads/13974920857639755.jpg

The most simple way to avoid bacterial growth in the holding tank would be to chlorinate the water prior to the holding tank. It would also be prudent to filter the water to avoid sludge accumulation in the tank - particularly if it is a spring, which is likely to have flashy turbidity particularly with the first strong rain events of each season.