Device-to-water-source compatibility

  • Where feasible, the efficacy of water treatment technologies offered to consumers is matched to specific contaminants present in their local water source.

Key indicator

  • Turbidity may require reduction via settling/sedimentation or coagulation/flocculation in order to allow for other treatment options. For example, the following technologies have the corresponding requirements for influent turbidity values:
    • Ultraviolet: influent <30 NTU (Laurent, 2005) for efficacy.
    • Slow sand: influent ≤20 NTU (Davis, 2002) for efficacy.
    • Ceramic: influent ≤20 NTU (Laurent, 2005) to mitigate clogging of filter element.

Notes and exceptions

  • Emerging technologies and products may allow one device to be “customized” for specific contaminants.
  • Turbidity and dissolved solids are key variables in source water and can determined the effectiveness and user satisfaction with HWTS products.

Supporting evidence

A large, rectangular, concrete vessel holding water, with metal bowls sitting along the back ledge.

The device should be appropriate for treating water from the local water source. Photo: PATH.