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Fences and barriers around swimming pools are indispensable. It is mainly with them that we can limit access to the pool area.
You will find all the useful information here : http://www.perfectswimming.com/en/controlling-access
According to Canadian fencing industry standards, the depth to be reached is 4 feet (1.2 meters). This depth may vary depending on the type of soil encountered and the type of fence installed.
Regulations varies from one city to another. You have to check with your city before hiring a fence contractor.