The input provided consists of three elements – pools, equipment, and WR4.
Pools refer to artificial or natural bodies of water that are designed for swimming, recreational activities, or sports.
Equipment could refer to any tools, machinery, or devices that are used in the maintenance, cleaning, or operation of pools.
WR4 is a code or abbreviation that could refer to a specific type of pool equipment or a particular model or brand.
Without further context, it is difficult to determine the exact meaning of WR4 in this scenario.

















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