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Filtration vs Treatement

Greywater Treatment Systems kill bacteria within the water, as well as removing solids and foreign particles.

Treated water (class A) can be re-used on the garden and in the house via toilet cisterns and the washing machine. A good quality system will generally cost $18,000 including installation.

What is the difference between a greywater diversion system, and a greywater treatment system?

  • A diversion system only removes some solids from the greywater - with sufficient filtration to ensure the specialised greywater drip lines do not become clogged with large foreign matter.
  • A treatment system will remove / neutralise bacteria and coliform from the water.
  • Apart from water quality differences, the outstanding difference between the two styles is cost. Our EcoBowsers generally cost $$1,200 to $2,000 installed, compared with a treatment system costing over $18,000 installed.
             
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Why are treatment systems so expensive?

  • Chemical based treatment systems require a series of tanks, with controlled chemical delivery systems to process the water in several stages. These are complex systems, with a high level of engineering. In addition to the initial installed cost ($18,000+ for a quality system), annual maintenance is required and must be performed by a qualifiied technician.
  • Membrane systems are in development, and expected to be several years away from mainstream production. These systems are expected to cost approxiately $7,000 including installation.

What can I do with a treatment system that I can't do with a simple diversion system?

  • Diversion system grey water cannot be re-used in toilets and washing machines.

I want to save as much water as possible - should I install a greywater treatment system?

  • In our opinion the most efficient system for a regular household is:
    • 5,000 litre water tank, connected to the washing machine and toilet cisterns;
    • Greywater Diversion System re-directing shower and washing machine water to the garden, every day.
  • The total cost of these sytems is likely to be approximately $5,000 to $7,000 (before rebates).
  • An alternative system (eg greywater treatment system to re-supply the laundry and toilet water), with tank storage and pump for the garden will cost approximately $25,000 before rebates.

Can I fill / top up my pool with water from a greywater treatment system?

  • No. Class A water is not sufficiently clean for use in a pool. The only option for filling pools is rainwater and/or potable water.