Microbiological Testing Swimming Pools & Spa Baths

INTRODUCTION

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’.

REASONS

Microbiological contamination of the pool can result in pathogenic (disease forming) micro-organisms causing infections to bathers.  These contaminants can be introduced into the pool by bathers, from the pool filters and occasionally from defects in the pool engineering (e.g. that allow the water to be contaminated by sewage).

Tests should be performed monthly to monitor the presence of the following indicator micro-organisms:-

Test	Limit
Total Viable Count (24hr 37°C)	Maximum 10 cfu / ml
Total Coliforms	Maximum 10 cfu / 100 ml*
E Coli	Zero
Pseudomonas aeruginosa	Maximum 10 per 100 ml*
Legionella (Spa Baths only - quarterly)	Zero

*see full document for other acceptance criteria

Additionally tests should be performed:-

• before a pool is used for the first time
• before it is put back into use after being shutdown for repairs
• if there are difficulties with the treatment system
• if contamination has been noted
• as part of any investigation into possible adverse effects on bathers’ health
• to validate changes to pool treatment

OUR SERVICE

H₂O Chemicals Ltd perform routine pool sampling using trained and competent personnel.  All tests are carried out at UKAS Accredited laboratories.  We offer full sampling , testing, reporting and advice on ‘unsatisfactory bacterial results’.