Retention Cisterns Plus: Retention and saving water at the same time You need to install a retention cistern but do not want to miss the benefits of a rainwater harvesting system? The GRAF retention cistern is a combination of rainwater retention and rainwater harvesting. The detention can be larger if required. In this case, part of the rainwater can also be used in addition to the required detention volume. The rainwater can be used for watering gardens, flushing toilets, washing machines and cleaning. The use of rainwater means that up to 50% of drinking water can be saved, and up to 85% for commercial properties.
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