Originally Posted by hvacgaspiping
Aluminum should NEVER be used in a water flowing circuit, because the electrolytic corrosion that results. `Doesn`t matter what other metals are present, except some of the corrosion deposits from the aluminum will coat other metals. That`s why heat exchangers, pumps, water filters and strainers, condensers, boilers, and cooling towers don`t use aluminum in any of their applications.
Um i used to build water filters for a living and we used a cast-iron case and aluminum strainers, but never mixed in copper.