Item	Private Pools	Public Pools
(a) Water quality and standards	(i) E coli absent in 100 ml water sample	Same
	(ii) hydrogen-ion concentration not greater than pH7 in respect of pools in PUC area; between pH7 and 7.8 in respect of pools in ProRC area	between pH7.2 and 7.8
	(iii) Free residual chlorine (maintained at 0.5 to 1 ppm)	Minimum of 0.5 ppm for pools using ozone as primary disinfectant; minimum of 1 ppm for pools using chlorine as disinfectant agent
(b) Water testing and sampling	(i) Not less than once every day by pool staff for chlorine content and pH value	Measurement of free residual chlorine content and pH value on an hourly basis
	(ii) Monthly sampling by Health Inspectors for bacterial examination	Water samples for bacterial examination taken on a monthly basis taken by pool staff
(c) Filtration and change of pool water	(i) Covered pools - not less than once in 4 hours	Same
	(ii) open air pools - not less than once in 6 hours	Same
	(iii) Annual emptying for cleansing or upon notice	Same

Annex-comparison