oh, and it is very unlikely the pump is corroding, it is entirely plastic except for the metal center shaft which had no corrosion on mine after 6 months of no corrosion protection.

I've had the reserator for about 6 months running non-stop with de ionised water only. Recently it started to have long clanging fits which lasted 10-15 seconds and where lound!! like a marble was being thrown around in there. So I opened up the pump, put a small amount of grease between the propell...