Drainage cell is used in areas where additional structural support is required. For example, when placing very large boulders around an intake bay or pond reservoir, placed to cover the exposed surface of AquaBlox, they give more support when foot traffic is expected over a reservoir.
Other uses include up-flow areas in the floor of a pond or lake as they help slow and spread the water rising up through the area.
4 panels make 1m2.
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