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The number of skimmers you need depends on the size of the swimming pool. For average sized pools, they should be installed at both ends. For smaller pools, you can usually get away with one skimmer; this should be installed on the downwind side. In larger swimming pools, or pools with vacuuming systems, you will probably want to add a third skimmer in a centrally located position.
Wise placement of pool skimmers helps with maintenance, but also think about
placement of the inlets. Using several inlets and evenly spacing them will help
prevent the growth of algae and bacteria.
Source: Swimming Pool Idea Book