JBL pH-Control: When the appliance is connected and switched on, there is often a pulse-like formation of enormous bubbles at the CO2 - air stone, which can frighten the fish. After this it will revert to the bubble formation you set.
When the electromagnetic valve in the controller is switched off, the pressure in the entire system from the cylinder to the pressure reducer and the tubes and to the electromagnetic valve persists. When the valve is opened, the pressure in the system escapes first and then the system continues to operate as usual.
You can decrease / prevent this by reducing the operating pressure in your pressure reducer. In our new pressure reducers, this can be done with an Allen wrench under the black cover top.