APPENDIX 6: Water Quality Standards For Swimming Pool
The water in swimming pools shall be maintained at the following water quality standards at all times.
(I) Physical Quality
(a) The pool water shall be clear and clean. No scum or floating impurities shall be allowed to accumulate. The colour of the water shall not exceed 5 Hazen units and the turbidity shall not exceed 5 NTU.
(II) Bacteriological Quality
(a) E. Coli shall not be present in any 100 ml sample of water taken from the pool.
(b) Not more than 10 coliform organisms shall be present in any 100 ml of water taken from the pool.
(c) Not more than one out of five consecutive samples of the water, taken monthly, shall contain any coliform organisms in 100 ml of the water sample.
(d) No sample shall contain more than 200 bacteria per ml as determined by the 24-hour plate count at 37 ° C or by the membrane filter method.
(III) Chemical
- A free chlorine residual of not less than 1.0 mg per litre and not more than 3.0 mg per litre shall be maintained in the pool.
- If copper sulphate is used as an algicidal agent, copper sulphate concentration of the water determined as copper shall not exceed 0.2 mg per litre.
- The pool water shall have a pH value of between 7.2 and 7.8.
- If cyanuric acid is used as a stabilizer for chlorine (either separately or in combined form), its maximum concentration shall not exceed 100 mg/litre in the swimming pool water.