My local rugby club are having intermittent pressure drop problems with their showers. I’ve done quite a lot of domestic plumbing but need advice on this. The system is set up with 4 large hot water storage tanks, there are 4 pumps each which have a flow sensors on them. There are 10 showers each for home and away. I think 2 tanks and 2 pumps service each set up of 10 shower heads. Each shower is operated with non concussive button valves. I’ve noticed that when the pressure is low when all 10 showers are activated, sometimes only 1 pump runs. Could it be a flow sensor problem? If so how can these be checked? It’s the type which is clamped around the outside of the outlet pipe from the pump