i use a Sedra 3500 on my G2 skimmer. I also run a Rio HF 21 and 32 for my return pumps and they have been fine. I have another Rio HF 17 and a 1400 that the impellers locked up on after a week of being out of the water. I tryed to loosen them in viniger, water, and nother would break them free. They finally ended up cracking on me so now I have to almost new pumps with no impellers in them. I cannot find impellers for the Rio HF 32 anywhere.