old

Hi everyone, I've had a few problems with my neptune dos. It's second hand and seems to be fairly old, I was wondering if it is probably time to replace the heads of the doser. It's not properly working at the moment I tried to have the lines at about 2 feet from the inlet of the doser and no...

Anybody want to save me some research time and tell me if any of this old filtration system is worth keeping? The heater module looks neat but I'd have to be able to replace the heater element. I believe the module next to it is a UV filter and I was told the bulb was burned out. I'm guessing...