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How often should the household water tower and water tank be cleaned?

The household water tower and water tank are prone to inviting pollution by insects, dusts, fuels, car exhausts, pesticides, fertilizers, herbicides, and degreasers. Coliform bacteria, nitrates, and other health-hazardous concentrations may be formed and breed, contaminating the water in storage.
So, water towers and tanks must be cleaned at least once a year. Hire a qualified water tower/tank cleaner to do the job pursuant to TWD’s relevant specifications.