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Water Quality in Pools

  • BLOG
  • Water Quality in Pools

Swimming pools closed due to pandemic were recently reopened. Microbiological and chemical analyzes of the opened swimming pools are carried out regularly.

Since the COVID-19 virus is easily affected by chlorine-based disinfectants, the amount of chlorine is now more important. The amount of chlorine should be measured regularly for the microbial quality of pool water.

Microbiological and chemical parameters in pool waters should be checked monthly.

 

Pool Water Chemical Properties

Parameter

Analysis Rage

Unit

Limit Values

Lowest

Highest

Cyanuric acid (1)

once per month

mg/L

-

100

Biguanid2

2

30

Hydrogen Peroxide (2)

40

80

pH (2)

6,5

7,8

Amonium (2)

 

0,5

Nitrite

 

0,5

Nitrate

 

50

Copper

 

1

Alüminium

 

0,2

Total alkalinity (2) (CaCO3)

30

180

Bound chlorine (3)

 

0,2

Indoor swimming pool water, free chlorine (3)

1

1,5

Outdoor swimming pool water, free chlorine (3)

1

3

Free Chlorine (4)

0,3

0,6

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(1) It is observed in pools where stabilizer chlorine compounds are used for disinfection of water.

(2) If “hydrogen peroxide + biguanide” is used in water disinfection, hydrogen peroxide should be in the range of 40-80. In this case, pH 8.2, ammonium 1.5 and total alkalinity up to 220 is considered appropriate. Free chlorine measurements are not made in these pools, hydrogen peroxide and biguanide are measured.

(3) It is observed in the pools where chlorine and chlorine compounds are used for disinfection of water.

(4) It is the level to be searched in pools where ozone, UV, chlorine dioxide and other disinfection systems are used for water disinfection.

NOTE: Hydrogen peroxide, biguanide and free chlorine measurements are made at the pool location.
Pool Water Microbiological Properties

Parameter


Recommended Method (1)


Frequency of Analysis (2)


Limit Values

Total colony (jerm) number


TS EN ISO 6222


Once a month


200 CFU (3) / ml


Total coliform bacteria


TS EN ISO 9308-1


0/100 ml

Escherichia coli (E. Coli)


TS EN ISO 9308-1


0/100 ml

Pseudomonas aeruginosa


TS EN ISO 16266


0/100 ml

_________________

(1) Apart from the proposed method, laboratories may use another method, provided they show their references.

(2) The frequency of analysis should be twice a month in periods of intense use of the swimming pool.

(3) CFU Colony Forming Unit (colony forming unit).

 

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