Folks, I'm a newbie to pool maintenance but have had a spa for 20+ years so I can sort of relate. I have an old Master Pool (post WW2 but really not sure of age) which may possibly have metal pipe in the system. Just purchased home last fall. Opened 4 weeks ago. Should I be concerned about running a Liquidator or an erosion device? Not sure of the corrosion factor on the metal. The previous owner had 3 floaters which I am using in addition to shocking with LQ in heavy doses. The cover was on for 3.5 years so I'm getting the black swamp back to a pool. I'm considering a Liquidator once I get the water straight.