If never heard of anything like this but it is REALLY hard stuff and all over the inside of the pump. It is also discharging a redness that looks like rust. It is not rust and I have acid washed, scraped and bashed most of it off and the paint surface comes out new underneath. Are these barnacles? Or maybe black algae that has run wild?
What do you think?
Blue Paint Underneath
All those granules are rock hard.
Let me know if the flicker photos do not come through.