Just got a couple replacement heads for my march pumps -- the SS chugger heads. I'm pretty annoyed that they impeller is plastic... Impellers can't be made of SS, it's too heavy and would decouple the magnets.
On another note, I'm looking at my March pump and it says:
"For longer and quieter performance keep housing filled with liquid." Is it politely telling me not to run it dry, or is it suggesting that I keep the whole thing submerged in a liquid like an oil? Just don't run it dry.