A system and method for treating graywater by solely mechanical means includes a filter tank receiving graywater through an inlet. The graywater is directed through a pre-filter and a filter assembly. A filter tank aeration element delivers air to the graywater. Optionally, a water quality sensor determines whether one or more qualities of the aerated and filtered water are outside stored parameters and, if so, drains the aerated and filtered water. The aerated and filtered water is removed from the filter tank without further treatment, optionally to a storage tank. Optionally a storage tank aeration element aerates water in the storage tank.
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