With the federal government this year waging a campaign highlighting the dangers of pools, a Massachusetts lawmaker pushing stricter safety measures and, most recently, four young children who drowned in backyard pools, a number of owners are installing alarms and safety fences or going even further, paying thousands of dollars to remove their pools altogether. The US Consumer Product Safety Commission has launched a public service campaign aimed at reducing pool accidents, noting that since Memorial Day, there have been reports of some 210 accidents in pools and spas across the country, either drownings or close calls.