Is Old SWG System Still Good?

[pool512]

I recently bought a home with a pool I'm learning to take care of. I've switched from the pucks that were being used to liquid chlorine, after struggling with algae and not being able to keep up with chlorine demand (due to high CYA levels).

Now that I've figured out the liquid chlorine option, I'm interested in the possibility of switching to SWG. I have an old SWG wall unit (pic below), but the cell is gone, and the previous owners were using pucks.

Question is... any idea how could I determine if the wall unit works, and whether I would simply need to buy/install a new salt cell?

Thanks!
Brian

 

[RJ-45]

Just power it on and check the voltage, if you are getting like around 30V, the box could be good, you can try plug in a T-15 cell.