Question from Angela Scott, via email:
We have several spa bath type installations which are connected using flexible pipework. We have recently discovered that some of the installations have higher levels of Legionella bacteria than we would like. Are there any recommendations for how to connect to this type of bath? Or any standard maintenance procedures that will ensure levels are kept to a minimum?
Answer from Steve Harris, technical services engineer, Wavin:
Legionella is found in all drinking water, it’s the conditions surrounding the pipes that cause the problem. If the room temperature or any local heat source is higher than normal, this can incubate the bacteria to multiply – 36ºC is the perfect breeding temperature. In a room containing a spa, I would think the room will be a little warmer than normal. But regardless whether the pipe is made from plastic or copper, or in fact any pipe material, Legionella will grow. There is no proven evidence that using flexible pipe can contribute to Legionella growth.
Please read the PDF regarding Legionella with plastic pipe.