Young Blonde Girl Posing In The Infinity Edge Pool At The Sea

If the catch basin is too small, swimmers will force out water ("bather displacement"), more than the catch basin can hold. This can lead to catastrophic landslides or hillside erosion. If the basin is too small, the edge-system pump may also draw down the catch basins' level, before the water has returned in sufficient quantity for the edge pump to retain its prime. The catch basin also needs to have additional holding capacity (above its static level - known as "freeboard"). The freeboard is the available extra capacity to hold the bather displacement and rain water, before it reaches the level of the overflow line.
Dedicated filtration systems are required on both systems. The edge pump is usually a much larger pump. This is required to overcome bather displacement, water in transit and to raise the upper pool's level. It would be a waste of energy to run such a large pump as a primary filtration system. Adequate filtration is required on the edge-system (based upon the edge-system flow rate), as most of the debris flows over the weir and into the catch basin. A smaller circulation pump can be used for daily filtration on the main pool. Failure to install filtration on the edge-system will result in the debris in the basin being blown back into the upper pool, clouding the water and contaminating the upper pool.
An automatic fill device is incorporated into the catch basin. Electronic autofill sensors are preferred by the leading designers, as they have a built-in delay to compensate for wave action from bather surges. A common toilet cistern refill device should not be utilized, as they constantly bob up and down, causing annoying hissing sounds and water hammering in the nearby structures.
Infinity edge pools were the beginning of the mainstream trend to create architectural swimming pools, elevating swimming pools to an art form for aquatic designers, aquatic architects, watershape designers or watershapers.