Can be easily see the people as the water level near by the terrace level. Any negativity can be immedistely noticed, increases safety. Provides an excellent architectural aesthetics. It prevent overflows unbalanced if may occur posibble slopes in the ground pool. The waves in the pool does not return the pool wall. It is absorbed. That goes from Tunnel system to the owerflow channel therefore that would not be wave surface of the water. Installation / unbalanced water discharge discharge errors rhat may occur due to workmanship, design isolated. It offers the possibility of use with or without a grid. It makes the terraces less wet.