Skimmers repair this problem by periodically clearing the highest of the water. Overflow swimming pools have the water level that's flush or barely beneath the deck edge, with an overflow channel alongside the pool border. The channel catches water spillages/overflows and directs it to a below pool balance tank for filtration. Like any other channel that drains the water, overflow cha... http://daojianchina.com/home.php?mod=space&uid=378867