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Biosystems 250gm Grey Water Additive

GWA [Grey Water Additive] For treating wash water from household drains so it can be re-used in garden, yard & toilets.


  • Degrades oils and greases found in domestic bath, shower, laundry & kitchen waste water.
  • Degrades residues: soaps, shampoos, cosmetic wastes and body fats from bathrooms.
  • Controls odour in drains and irrigation water.
  • Replaces the natural bacteria destroyed by heating and detergents.
  • Greatly improves the quality of your final effluent into the environment.
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Excl. Tax: R 513.16 Incl. Tax: R 590.13

Product Description


GWA Shake directly onto the water in the storage tank and stir in with a long strong stick. If tank is inaccessible, wash down the sink / basin waste. GWA is very ‘strong’ and a little goes a long way. Water will not be potable quality. Avoid play areas.

On existing systems, there will be an historical build-up of fat in the tank and lines. With new systems, double the dose for the first two weeks. Once GWA has settled in and begun to break down the fats, the system will run clean and odour free. After a few weeks, you may be able to reduce the dose by observation, but never stop the routine dosing.

Dosages - Based on typical results achieved under average conditions
Depends on the size of your water storage system

  • Typical 3 bed roomed house with 500lt storage tank - 10grm / week.
  • 4 bed roomed house with 1,000lt storage tank - 20grm / week.
  • Thereafter, calculate dosage on the size of the storage tank - 10grm / 500lt / week.

Average Use

  • GWA 125 gm - Lasts a 500lt system for 3 months.
  • GWA 250 gm - Lasts a 1,000lt system for 3 months.
  • GWA 500 gm - Lasts a 2,000lt system for 3 months.

Note: 5grm = 1 x heaped teaspoon. GWA will be sent in a plastic ‘mini-grip’ re-sealable / semi airtight pack to save on postage costs.

Additional Information

Additional Information

Disclaimer Please note that stock availability is subject to prior sales. Prices exclude delivery. The image serves as an example of what the product looks like and may differ slightly in appearance.
Guarantee/ Warranty 3 month product warranty


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