ACVM Approved P009479

Water Tank Treatment

Water Tank Treatment

Totally Chlorine Free

Huwa.San Water Tank Treatment is suitable for the safe disinfection of water in domestic and commercial water storage tanks used for drinking water to home, baches, holiday homes, camping grounds, lodges, cafes, farm-stays, boats, caravans and motorhomes.

Drinking water safety

Water collected from roofs, streams, or other untreated sources in the environment can rarely be relied upon to consistently provide safe drinking water. Even water that is safe when collected can quickly become infected in storage tanks and plumbing systems, and without some form of protection, dangerously high levels of harmful pathogens can quickly take over. Because the quality of water can change so quickly, and unpredictably, very few people these days drink untreated water by choice.

Studies of rainwater tanks in New Zealand have consistently shown that a large percentage of the population regularly drink water from water supplies that are dangerously infected by pollutants.

Huwa.San provides a safe way to treat small commercial and domestic water supplies, such as on farms, holiday homes, camping grounds and many others in a way that is safe, effective, and uncomplicated.

Huwa.San is a highly effective natural disinfectant that is fully biodegradable into just oxygen and water, is non-toxic, and produces no harmful disinfection by-products in the water.

Huwa.San Water Tank Treatment can also be used as a versatile general purpose anti-viral disinfectant, ideally suited to a wide variety of uses where the ability to destroy bacteria, viruses, and fungal and mould spores on surfaces is required. Used undiluted, for very badly affected surfaces, or diluted with up to three litres of clean water per two litres of Huwa.San, it can be used very safely to destroy mould spores on surfaces in wet areas, or following flooding damage to buildings.

Follow the instructions on the container to ensure optimal performance.


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  • Controls all forms of bacteria, viruses and algae commonly found in untreated drinking water
  • Completely eliminates the use of chlorine and other unpleasant chemicals in the water
  • Provides a long lasting effect and excellent shelf life due to the unique silver stabilisation
  • Effective over a wide range of temperature, pH, and turbidity levels
  • Colourless, odourless and tasteless and 100% biodegradable into water and pure oxygen
  • Does not form dangerous disinfection by-products in the water
  • Breaks down and removes potentially dangerous biofilm build-up in pipes and equipment
  • Approved in New Zealand for use as a water treatment chemical
  • Use at the rate of 2 litres per 20,000 litres of water
  • Leaves the water pure fresh and healthy


When to use Huwa.San water tank treatment

  • If unpleasant tastes or odours develop in the water
  • If bird or animal deposits are found on the roof or in the gutters
  • If the water has not been used for some time (Holiday homes, baches, RVs or boats)
  • If contaminated water has entered the system
  • Anytime a member of the family displays medical problems
  • After each 28 days of normal use
  • Any time you think it needs it

Please use BIOXtest test strips to test the water.

Intended users:

Private and commercial stored water supplies. Emergency response teams, international aid agencies, for pandemic disease control measures and for long term improvement of drinking water and hygiene standards in under developed areas


Apply by simply pouring into the top of the water tank. Spread over the surface of the water if possible. Disinfection will normally be complete within 24 hours, but may be safely used sooner. For dosage, please check the label.

Always use Huwa.San WTT  in conjunction with normal water tank hygiene practices.

Use biocides safely. Please read the label safety instructions before use.