My varistream is 6yrs old. Starting to wonder if it works as it was designed. On setting A, if I change the flow from 4 to 3, P appears and the pump stops and then starts. However if I use the aquadapter all the pump does is grind to a stop as the water fills the system. I thought that the pump would sense a sudden pressure drop and switch off like it does when I drop the flow rate. I’m not sure this varistream is doing its job