Hello,

I have this thing on my basement, which is between my water inlet and my boiler tank. The flow goes from right to left on the picture, but there is some water going down (approx 2 or 3 L per day) and is going to waste. Any idea what this is and if I can prevent to lose taht much water for nothing ?

I tried to turn the knob on the top but it didn’t really do anything it seems.

Thanks for your help !