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Current guidance in the UK by PWTAG recommends maximum times for overall pool turnover for a range of pools in order to address these issues. The recommendations for pool turnover time, however, vary and are dependent on the type of pool facility (Table 1). The objective of these recommendations is to prevent the accumulation of chlorine-resistant pathogens and other dissolved pollutants. PWTAG (2009) also recommends that for all pools uniform dye dispersion should be achieved within a 15 minute period. This aims to ensure that adequate mixing takes place to maximise the efficiency of the treatment of non-chlorine-resistant pathogens. The combination of these guidelines aims to create a balance between plug flow and fully mixed hydraulic designs, however no evaluation with respect to the appropriateness of these specified guidelines has been published to date.

Table 1

Recommended turnover times for various swimming pool facilities (adapted from PWTAG (2009))

Pool typePool turnover
Competition 50 m pool 3–4 hours 
Diving pools 4–8 hours 
Hydrotherapy pools 0.5–1.5 hours 
Leisure pools (1–1.5 m deep) 1–2 hours 
Leisure pools (>1.5 m deep) 2–2.5 hours 
Pool typePool turnover
Competition 50 m pool 3–4 hours 
Diving pools 4–8 hours 
Hydrotherapy pools 0.5–1.5 hours 
Leisure pools (1–1.5 m deep) 1–2 hours 
Leisure pools (>1.5 m deep) 2–2.5 hours 

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