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454.1.9.8.6.1
All (100 percent) of the water from the collector tank must be first filtered, treated by an NSF Standard 50 certified UV disinfection unit with a minimum 40 mJ/cm2 dose, and then final treatment provided by disinfectant adjustment chemicals before any of this treated water is piped to the water features.
454.1.9.8.6.2
In the design above and the alternative below: excess water not required by the water features shall be returned to the collector tank; the recirculation system shall be sized to treat the contained volume of water based upon a 30 minute turnover with a chlorine feeder/generator capable of producing a dosage of at least 12ppm; and the UV disinfection equipment shall be electrically interconnected such that whenever it fails to produce the required UV dosage, the water spray features pump(s) and flow will be immediately stopped.
454.1.9.8.6.3
In lieu of Section 454.1.9.8.6.1, the recirculation system must be designed to continuously return 100 percent of the water to the collector tank after all (100 percent) of the water is first filtered, treated by a validated UV disinfectant unit with a minimum 40 mJ/cm2 dose described in Section 454.1.6.5.16.6 on each feature pump and then final treatment with disinfectant and pH adjustment chemicals, before any of this treated water is piped to the water features. UV flow capacity must meet the feature pump(s) flow capacity.
454.1.9.8.6.4
The flow rate through the feature nozzles of the water features shall be such as not to harm the patrons and shall not exceed 20 feet per second (6096 mm/s) unless justified by the design engineer and by the fountain system manufacturer.
454.1.9.8.6.5
An automatic water level controller shall be provided.
454.1.9.8.6.6
An overfill waste line with air gap shall be provided.
454.1.9.8.6.7
A means of vacuuming and completely draining the tank(s) shall be provided.
454.1.9.8.6.8
454.1.9.8.6.9
IWFs shall be fenced in the same fashion as wading pools as noted in Section 454.1.7.7. Where the walking distance is at least 50 feet (15 240 mm) between the IWF and all other pools and the IWF is not designed to have any standing water, fencing requirements should be carefully considered by the applicant to control usage, but are not required by rule. Effective barriers that are designed to define the walking path shall be subject to review and approval by the department.
454.1.9.8.6.10
A minimum 4-foot-wide (1219 mm) wet deck area shall be provided around all IWFs. The wet deck shall meet the requirements of Section 454.1.2.2.3; however, up to 50 percent of the perimeter may be obstructed.
454.1.9.8.6.11
IWFs shall be constructed of concrete or other impervious and structurally rigid material.
454.1.9.8.6.12
Floor slopes of an IWF shall be a maximum 1 foot (305 mm) vertical in 10 feet (3048 mm) horizontal and a minimum of 1 foot (305 mm) vertical in 60 feet (18 288 mm) horizontal.
454.1.9.8.6.13
In addition to the requirements of Section 454.1.2.3.5, all IWF pool rule signs installed shall have the following added in one inch letters:
"Do not swallow the fountain water, it is recirculated."
"Do not use fountain if you are ill with diarrhea."

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