It's your pool and you can do whatever you want. Personally, I would not because every bather adds fecal matter, urine, and sweat to the water (sweat is almost identical chemically to urine) no matter how clean they THINK they are.This is why fast acting residual oxidizing sanitizer is needed. Your laws in the UK are very different from ours in the US and products like this are not permitted to be sold as primary sanitizers
The risk of water borne illnesses are real. Personally I would not take the chance.
As I initially stated I am not a fan of metal based systems for several reasons.