I just threw a new 2-speed motor on my pump's wet end, and since I'm new to this, I'm not sure if it is normal that I see a good bit of air in the pump basket when it's running on low speed? It's fine when it runs on high speed. Overall, it seems like everything is working better (skimming) or at least the same (water pressure coming back in the return), so there's that. It's just the low speed that I wonder about.