I've used needle wheel skimmers since 2004-ish, including brands like Deltec, EuroReef, and Vertex. Recently, the pump on my Vertex skimmer died, and I decided to retrofit it with a DC skimmer pump from coralvue, the VarioS6s. It has been an exercise in futility. Without fail, the needle wheel impeller gets hopelessly clogged up with debris within 2 days of cleaning it, and the skimmer stops skimming due to inadequate air intake. I have to pull the entire pump, disassemble it, clean it, then repeat every two days. I have given up, and am not happy I spent $350+ on what is now a paperweight. All the water prior to the skimmer is pre-filtered via filter socks. I could literally let the Deltec, EuroReef, and vertex skimmer pumps run year round, cleaning them twice a year, and even if the impellers had debris in them, they would never stop skimming. Has anyone else experienced this issue with these pumps?