Minn. R. agency 144, ch. 4717, POOLS; LIFEGUARDS; AND EQUIPMENT, pt. 4717.1750 - POOL WATER CONDITION
Subpart 1.
Maximum water temperature. The water temperature in a pool must
not be more than 104 degrees Fahrenheit.
Subp.
2.
Test kits. Each pool must have the testing
equipment specified in this subpart:
A. a DPD
(Diethyl-P-Phenylene Diamine) test kit to measure the concentration of
disinfectant in water, accurate within 0.1 parts per million;
B. a phenol red pH testing kit accurate to
the nearest 0.2 pH unit;
C. a test
kit to measure alkalinity using the methyl orange or equivalent method;
and
D. where cyanuric acid is used,
a test kit to test cyanuric acid concentration.
Subp. 3.
Disinfection residual.
When in use, a pool must be continuously disinfected with a chemical that
imparts an easily measured, free available residual.
A. When chlorine is used, a free chlorine
residual of at least 1.0 parts per million must be maintained throughout the
pool.
B. When bromine is used, a
bromine residual of at least 2.0 parts per million must be maintained
throughout the pool.
C. The
disinfectant concentration in an operating pool must not exceed ten parts per
million for chlorine and 20 parts per million for bromine.
D. If other halogens are used, residuals of
equivalent disinfectant strength must be maintained.
E. If the concentration of combined chlorine
residual exceeds 0.5 parts per million, the pool must be super chlorinated or
treated to reduce the concentration of the combined chlorine residual to not
exceed 0.5 parts per million.
Subp.
4.
Disinfection of spa pools. The disinfectant
residual in a spa pool must be at least 2.0 parts per million for free chlorine
and 4.0 parts per million for bromine throughout the pool when in use.
Subp. 5.
pH. Water in
the pool must be maintained with a pH of not less than 7.2 and not more than
7.8.
Subp. 6.
Alkalinity. The alkalinity of the water in the pool must be at
least 50 parts per million.
Subp.
7.
Water clarity. Whenever the pool is open for use,
the pool water must be clear enough so the bottom drain is easily visible.
Subp. 8.
Use of nontoxic
chemicals; chemical container security. Chemicals used to control water
quality must not impart toxic properties to the water. All containers used for
chemicals must be kept in a secure location, inaccessible to pool users, and
properly labeled and stored according to the manufacturer's instructions.
Subp. 9. [See repealer.]
Subp.10. [See repealer.]
Subp.11.
Use of cyanuric acid.
A. Use of cyanuric acid in any new indoor
pool is prohibited after the effective date of this rule.
B. Use of cyanuric acid in any existing
indoor pool is prohibited two years after the effective date of this
rule.
C. Use of cyanuric acid in
any pool requires testing and recording of the cyanuric acid level at least
once a week.
D. Where cyanuric acid
is used to stabilize chlorine, the concentration of cyanuric acid in the pool
must not exceed 100 parts per million.
Notes
Statutory Authority: MS s 144.05; 144.12; 144.123; 145A.02; 157.01
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.
No prior version found.