This type of pool has an overflow either on one or both sides as long as they form an angle, where usually the pool water line “ends” in perspective in the sea at the edge of the horizon. We usually find it in constructions where there is an altitude difference with a sufficient slope of the ground and open view to the horizon and especially the deep blue of the sea. In terms of cleanliness, it has all those features that ensure fast and efficient water purification. Construction also requires an overflow tank with an engine room but with a shorter overflow channel length.