Pool water is always susceptible to contamination and
degradation. This can allow conditions
to develop which supports the growth of micro-organisms. To maintain water quality the independent
watchdog The Pool Water Treatment Advisory Group (PWTAG) recommends regular
microbiological testing of swimming pool water according to guidelines laid
down in a BSI Code of Practice PA39:2003 Management of Public Swimming Pools. Water Treatment Systems, Water Treatment
Plant and Heating and Ventilation Systems.