Wisconsin Administrative Code
Department of Agriculture, Trade and Consumer Protection
ATCP 55-89 - Food, Lodging, and Recreation Safety
Chapter ATCP 76 - Safety, Maintenance, and Operation of Public Pools and Water Attractions
Subchapter III - Water Treatment Systems and Water Quality
Section ATCP 76.11 - Recirculation system

Current through August 26, 2024

(1) GENERAL. Each pool shall have a water recirculation system with disinfection treatment and filtration equipment consisting of overflow gutters or skimmers, main drains, inlets, pumps, piping, holding tanks, and filters. The system shall be operated continuously except for seasonal closing or during periods of necessary maintenance. P

Note: See s. SPS 390.14 for design requirements for the recirculation system.

(2) SKIMMERS AND RECIRCULATION FLOW. Skimmers and recirculation flow shall meet all of the following:

(a) Skimmer flow.
1. The flow through each skimmer shall be adjusted as often as necessary to maintain a vigorous skimming action at each skimmer. Pf

2. The pool water level shall be maintained at an elevation so that continuous effective surface skimming is accomplished through skimmers or over the gutter lip. Pf
a. For gutter pools, approximately 75 percent of the required recirculation flow shall be through the gutter and 25 percent through the main drain during normal operation. Pf

b. For pools with skimmers, approximately 80 percent of the recirculation flow shall be through skimmers and 20 percent through the main drain. Pf

c. For reverse flow pools, 100 percent of the required recirculation shall be through the gutter or skimmer. Pf

(b) Skimmers maintained.
1. Skimmers, skimmer weirs, and overflow gutters and drains shall be maintained so that they are clean.

2. Skimmers, skimmer weirs, and overflow gutters shall be repaired or replaced as needed.

3. Skimmer covers shall be securely seated on deck.

(c) Inlets. Inlets shall be checked and adjusted to ensure that the rate of flow through each inlet is such that a uniform distribution pattern is established. Inlets in pools with surface skimmers shall be directed as necessary to ensure that there is effective skimming in all areas. Pf

(d) Strainer baskets or screens.
1. Strainer baskets or screens shall be continuously in use and maintained.

2. Clean spare strainer baskets or screens shall be available.

3. Strainer baskets for skimmers and pump strainers shall be cleaned at least daily.

(3) SURGE TANKS. Surge tanks shall be operated within designed water levels.

(4) PUMPS. Pump operation shall meet all of the following:

(a) Operational specification. The pump manufacturer's maintenance and operating instructions shall be followed. Pf

(b) Continuous operation. Recirculation pumps shall continuously achieve the designed pool water recirculation rate except during maintenance operations. Pf

(c) Turnover rate. The turnover time for pools shall be pursuant to s. ATCP 76.11 Table A and B. Pf

(d) Alternative pool type; turnover rate. If a pool is used as an alternate type of pool including a whirlpool used as a pool, the recirculation shall follow the stricter turnover time. Pf -

Pool Type

Turnover Time (in hours)

Swimming

6

Diving

6

Lap Lanes

6

Activity

2

Interactive play attraction

0.5

Leisure river

2

Plunge

1

Runout slide

1

Vortex

1

Wading pool

1

Whirlpool

0.5

Therapy and exercise pools

See s. ATCP 76.11 Table B

Cold soak

4

s. ATCP 76.11 Table B Maximum Turnover Time for Therapy and Exercise

Pool Temperature in °F ( °C)

Load (gals/person)

Maximum-Turnover Time (hours)

<72-93 (22-33 °C)

> 2,500

4

<72-93 (22-33 °C)

> 450

2

<72-93 (22-33 °C)

> 450

1

>93-104 (33-40 °C)

N/A

0.5

N/A = not applicable.

(5) FLOWMETERS, VALVES, AND GAUGES. Flowmeters, values, and gauges shall be all of the following:

(a) Maintained. Maintained in operating condition.

(b) Installed. Installed per manufacturer instructions or as verified by the pump curve. Pf

(5m) PIPING. Piping shall comply with all of the following:

(a) Identification. Water treatment system piping shall have permanent labels, numbered tags, or a color coding system that identifies valves, piping, and the direction of water flow.

(b) Readable chart. Labels, tags, or color coding shall correspond to a conspicuously posted, easily read chart that explains the system.

(6) FILTERS.

(a) General requirements.
1. The manufacturer's data plate shall be visible on all filters.

2. Filter shells and appurtenances shall be maintained in operating condition. Pf

3. The backwash procedure shall follow the filter manufacturer's written directions.

4. Backwash procedures shall be conspicuously posted in the filter area on an easily read chart.

5. Filter media shall be inspected annually and cleaned or replaced when necessary.

(b) Sand filters. The following types of sand filters shall be backwashed as recommended by the manufacturer:
1. Rapid-rate sand filters. Pf

2. High-rate sand filters. Pf

3. Vacuum sand filters. Pf

(c) Diatomaceous earth filters. Diatomaceous earth filters shall meet all of the following:
1. Pressure and vacuum type diatomaceous earth filters shall be backwashed as recommended by the manufacturer. Pf

2. Septum covers shall be removed, cleaned, or replaced when they no longer provide effective filtration or create a friction loss preventing maintenance of the required recirculation rate. Pf

3. Diatomaceous earth wastewater separation tanks, where installed, shall be cleaned according to manufacturer instructions. Pf

4. Positive displacement feeder suction intake shall meet all of the following:
a. Suspended at least 6 inches above any sludge layer in the solution tank. P

b. In labeled tanks for mixing and distribution of slurry.

c. Mixing and distribution tanks shall be covered with a screened vent.

d. Installed and maintained to prevent backflow of water into the tanks and to prevent the slurry from being siphoned out of the tanks into the pool recirculation system. P

5. Diatomaceous earth slurry feeders shall meet all of the following:
a. The lowest effective concentration of solution shall be used in a diatomaceous earth slurry feeder.

b. The concentration of solution may not exceed 5 percent by weight. Pf

c. The diatomite slurry feeder head and lines shall be flushed as recommended by the manufacturer to assure proper and continuous operation. Pf

d. Water from the discharge side of the recirculation pump may be used.

e. If connection is to a potable water supply line, the supply line shall be equipped with an approved backflow or backsiphonage prevention device. P

f. Diatomite slurry tank agitators shall run continuously. Pf

(d) Cartridge filters. Cartridge filters shall meet all of the following:
1. Removed and cleaned as recommended by the manufacturer. Pf

2. Replaced when plugged or damaged. Pf

3. A duplicate set of replacement cartridges shall be available on-site and used when removing a soiled cartridge from the filter for cleaning. Pf

(e) Activated filter media, filter ball media, and glass filter media.Activated filter media, filter ball media, and glass filter media shall be maintained and backwashed according to the manufacturer specifications. Pf

(f) Other media types. Other media types as approved by the department shall be maintained and backwashed according to the manufacturer specifications. Pf

This section is created eff. 9-24-23 by CR 22-021.

Disclaimer: These regulations may not be the most recent version. Wisconsin may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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