This style of return jet allows you to easily direct the water flow completely downward to reach portions of the pool that might not be getting sufficient circulation. Having gone through the salt chlorinator system, the water returning to the pool has more concentrated sanitizer in it, and distributing it to the edges, corners, and deeper part of the pool is often beneficial, because this is where algae can begin to get a foothold. Accordingly, this type of jet is often most beneficial when used in the deeper part of the pool. The arrangement of your return jets is unique to your pool - depending on the number and placement of your existing returns, you want to achieve maximum circulation and movement of all of the water in the pool back to your skimmers and suction.