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.