Commercial Vinyl Pool Clarity Dot
6″ Vinyl Clarity Dot in an 18″ White Round Field.
Standard
Every owner and every operator of a public swimming pool shall ensure that pool water is of sufficient clarity to permit a black disc (150 millimeters in diameter on a white background) located on the bottom of the pool (in the area of its greatest depth) to be clearly visible from a point on the deck nine meters away from the disc. When the disc is not clearly visible, the entire pool shall be closed.
Definitions
Owner: the person or corporation who is the owner of an aquatic facility.
Operator: the trained individual designated by the owner to be responsible for the day to day operation of an aquatic facility.
Public Swimming Pool: a swimming pool being operated for the use by the public.
Swimming Pool: an artificially constructed basin, whether indoor or outdoor, lined with concrete, fiberglass, vinyl or similar material in which persons can swim, wade, or dive.
White Background: must surround the black disc at least 150 mm beyond the disc.
Rationale
Lifeguards must be able to clearly see all of the pool bottom in their designated zone at all times. This will ensure they are able to provide proper supervision of bathers within their zones.
Water clarity can be reduced for many reasons including: poor water quality, lighting levels, rain, strong wind, etc. In cases where bottom visibility is affected by glare or surface distortion, lifeguards should reposition themselves to see all of the pool bottom in their zone of supervision. In these cases, water clarity may meet the standard and the pool may remain open.
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