I know there is some debate about the efficacy of having an anode in the plumbing like this:

That said, let's say I want to put one in "just in case" as part of my upgrades to my pump, filter and adding an SWG. Where should I put it? After the pump? After the filter? After the heater? After the SWG? Return that thing, it is totally useless?

That said, let's say I want to put one in "just in case" as part of my upgrades to my pump, filter and adding an SWG. Where should I put it? After the pump? After the filter? After the heater? After the SWG? Return that thing, it is totally useless?