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GHP Observation: The most important recommendation appears to be – Do Not Empty your pool unless it is designed to be emptied – let it go cold and keep some circulation and chemical dosing.

Also – Institute anti-Legionella practices and when re-heating do not exceed 1 Degree C per 4 hours.

An Operators Perspective:

We asked Noel Murphy, Group Operations Manager, Kildare Sports & Leisure Facilities, for some advice about reducing costs in swimming pools at this time.

“We haven’t emptied either pool in Naas or Athy but have reduced circulation and temperature as per the PWTAG guidelines.” said Noel Details here – PWTAG Guidelines on Temporary Pool Closure

Noel also noted a list of risks should a pool be left unmaintained;

The biggest concern would be if the Chlorine is to run out or feeder to go into Timeout, that there would be no Chlorine getting into the Pool. This can lead to a build-up of any bacteria already in the pool and the possibility of Legionella and Bio-films forming in the Pools, especially if there is little or no circulation. When the operator goes to restart the pool, you could have in a worst case scenario a legionella outbreak.

It is recommended that all the swimming pools stay full and that the circulation systems are maintained in an operating state – this means that pumps, air handling units and boilers are continuing to operate, even at reduced temperatures.

The associated risks are

Firstly, if there is a power cut, or surge, that the pumps will be tripped-out and then that there is no circulation, leading to legionella risks. The pumps and AHU will need to be restarted manually.

Secondly, you run the risk of overheating and fire, in the case that there is not someone checking on the pool plant on a regular/semi regular basis. Visual checks and listening to the pool plant are essential ways to maintain a healthy and safe Plantroom.

Thirdly, the risk of flooding can come from no circulation or via pool plant joints weakening/constricting due to the reduced running temperatures, in order to save on energy costs. Again, visual checks are essential to ensure leaks are identified.