new 16,000 gal concrete pool with epoxy coating using autopilot total control. water chemistry is good and all levels acceptable. have developed a few tiny rust spots coming thru the the epoxy. very very small ... a 1/16 " dia sort of thing. also the stainless pool lights have developed a bit of rust on the raw edges where they were manufactured... not on the smooth surfaces. the steel from the consctruction was all recessed and nuetralized and the entire surface plastered before the epoxy so the steel is at least 3/8 below the surface. i have used the epoxy before and it is a superb product. i spoke to the epoxy guys and they said " galvanic corrosion " ... needs sacridicial zincs etc... but..
1) other than the pool lights there is no metal in the pool at all... zero
2) the pumps are bonded and grounded.
3) all the pipework is plastic
so.. where is the potential that is causing this corrosion ? or... is it really something else.
the pool light issue doesn't really surprise me... they are chinese and their stainless sucks and often rusts by itself anyway but the pin spots comong thru the epoxy worry me.