Solenoid Valve

[Kitta]

I don't quite understand the need for this device. If there is a power failure, the water from the calcium reactor would stop feeding to the tank would it not? If the reactor is stop, there would be no excessive CO2 going to the main tank. The CO2 would still be going to the bubble counter but the CO2 would stay there and not going anywhere else.

 

[Robin Goodfellow]

hi.
Some people use the valve in conjunction with a pH controller for controlling the amount of CO2 going into the reactor. In addition, depends on the design of the reactor, the CO2 that got inside the reactor chamber during power failure may cause problem when the power is restored. This is because most reactor circulation pump is not designed for running dried.

It is true that it is not a "must have" item if you have a reactor.

 

[reefland]

I don't quite understand the need for this device. If there is a power failure, the water from the calcium reactor would stop feeding to the tank would it not? If the reactor is stop, there would be no excessive CO2 going to the main tank. The CO2 would still be going to the bubble counter but the CO2 would stay there and not going anywhere else.

And then the power comes back on and you start dripping in pH 4.x water into the tank. Which depending on water volume can mess things up quickly.