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Usually, common floor drain gets blocked up easily, as there is much rubbish in it. Even worse, the rubbish is difficult to clean up.
The concave-convex floor drain is designed to solve the problem. The concave surface of the water channel is made to stop the rubbish . When too much rubbish blocks in the concave surface ,which stops water from going through, water can still pass, via the holes in the convex surface. Furthermore,it is convenient for you to put the convex surface out and clean up the rubbish.
Xiangyong Wu，Haoyu Li
Cong Liu、Wei Huang、Sufang Tong