According to Foster and Briceno-Garmendia (2009), this would bring them closer to the amounts needed to meet the MDGs but could not compensate for the accumulated backlog. For example, good hygiene and sanitation may prove more important to protect health than clean safe water to drink delivered at the tap and is comparatively very cost-effective. In addition, the adoption of hygienic practices has been found to be a necessary condition for the benefits of investments in access to water and sanitation to be effectively realised. A number of experts have also recommended relying on point-of-use water treatment until more expensive water networks with centralised water treatment can be extended.