brs reactor

Hello everyone, This would be my first ro/di system, ive done a good amount of research here and I really want to get a quality system and uses standard filters. From what i've read most people either recommend Spectrapure or BRS systems. Would this 10 year old USED SpectraPure CSPDI-180-MF...

So I bought the BRS mini reactor with the 1.5 sicce pump. I filled it up as shown with rowaphos to use to lower my phosphates. When I turned it on it was tumbling pretty good but every day I check it, the media isn’t moving at all, but water is exiting the output tube into my sump. So it is just...