These ports attach to pool vacuum cleaners, which work something like ordinary vacuum cleaners except that they suck water instead of air. Most swimming pools also have a couple of vacuum ports, which are only used in pool cleaning. This eliminates the suction on the blocked drain. In a safe pool, there are always multiple main drains as well as several skimmer drains, so if somebody or something blocks one drain, the pumping system will pull water from one of the other drains. The only way the plumbing system could apply this sort of suction is if there were only one open drain. This system involves a lot of suction, but if the pool is built and operated correctly, there is virtually no risk of suction holding somebody against one of the drains. The water is pumped through the filtering system and back out to returns, inlet valves around the side of the pool.
This line keeps the skimmer from drawing air into the pump system if the water level drops below the level of the main inlet.
In addition to the main inlet, the skimmer system has a secondary equalizer line leading to a drain below the surface level. The water flows through the strainer basket, which catches any larger debris, such as twigs and leaves. To catch debris effectively, the goal is to skim just the surface level.
In the system described here, the floating weir, the door at the inlet passageway, swings in and out to let a very small volume of water in at a time. Any debris that floats - leaves, suntan oil, hair - leaves the pool through these drains. The skimmers draw water the same way as the main drains, but they suck only from the very top of the pool (the top eighth of an inch, typically). The return port A typical vacuum port A pool vacuum cleaner
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