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We up the chlorine levels before the meet and run the system right up until the first event. It is then turned back on the minute the meet ends. Levels are tested and stay within the required boundaries. We turn it off because the push of water in only two lanes is not fair to those swimming in those lanes. The pool is regularly inspected by both the pool management company and the health department. It generally scores between 95 and 98 on health department inspections.
Because of that law, all public pools have been required to change to new drain covers that prevent them from being completely obstructed. The style of the drain cover prevents that sort of suction to build up. Trust me. I am well aware of the potential for problems if suction builds up. A child at the pool I swam at when I was a kid (aeons ago) was in fact disemboweled in the kiddie pool because she sat on the drain cover. It was horrible. The design of the new covers prevent this.
It's more than just drain covers. They also need either two drains or to have a pressure sensing system installed that shuts off the motor if pressure beyond a certain level is detected. For us (HOA) installing the pressure sensing system was the less expensive option. Drain covers were the issue in the recent recall, though; supposedly 75% were inadequate at meeting the standards required by Virginia Graham Baker.