Safety

Pool and spa drains pose a serious risk of body entrapment and hair
entanglement, particularly to children, but are preventable hazards if
safety precautions, including the use of special drain covers, safety
vacuum-release systems (SVRSs), and other pressure-venting
fitler-construction techniques are used, say the Consumer Product Safety
Commission and The American Academy of Pediatrics. 

Among unintentional injuries, drowning is the second leading cause of death to this age group after motor vehicle accidents. In some Sunbelt states such as California, Florida and Arizona, drowning is the leading cause of accidental death to children under five.