Having a pool in your backyard is a luxury many Americans cannot do without. Over 21 million of us had a house with a pool in 2015 and that figure continues to grow. Our love affair with the water extends beyond the home with visits to water-focused venues such as beaches, pools, hot tubs and related aquatic venues reaching 400 million a year. In total, there were upwards of 5million unground pools in America in 2015. Having a pool, though, is not all fun and games. It means also having to clean and maintain it and that can take valuable…