(2) Pool shading. Since algae need sunlight for growth, shading the pool
will deter growth.
(3) Temperature. Pool water at a temperature of less than 80 F will
minimize the algae problem.
(4) Super chlorination. One of the most effective treatments is the
development of 10-ppm free available chlorine in the pool during nonswimming hours.
Excessively high residuals may be reduced to permit swimming by adding sodium
thiosulfate to the water at the rate of 1.0 to 1.5 ppm for each 1.0 ppm of residual
chlorine being removed.
(5) Pool scrubbing. As a last resort, the pool may be drained, and the
bottom and sides scrubbed with a 5 percent hypochlorite slurry or copper sulfate
solution to remove stubborn algae growths.
Part 5. Accidents and Hazardous Conditions.
1-17. ACCIDENTS AND DROWNING DEATHS
Accidents and drowning deaths are the most serious problems associated with
swimming pools. A good inspector will ensure that dangerous conditions and practices
are not present.
a. Supervision and Use of Equipment. Lack of effective bather supervision,
coupled with improper construction, use, and maintenance of equipment are prime
causes of accidents.
(1) Cracked or flaking concrete in the pool area is a possible hazard, since
swimmers may trip or cut themselves.
(2) Pool ladders, diving board supports, diving towers, and lifeguard chairs
should be periodically checked to determine that they are firmly anchored and in good
(3) Ladders and diving equipment should be inspected for the presence of
any foreign matter, which would make them slippery.
(4) After maintenance or inspection of moving parts or electrical connections
in the equipment room, a safety check should be made. The purpose of the check is to
ensure that all safety guards and electrical box covers are replaced and valves are
properly tagged and positioned. Electrical circuits should be inactivated before working
on any equipment.
(5) Where wetness or other conditions causing slippery walking surfaces
occur; nonslip surface treatments should be applied.