I am currently running Lim Wave I 1/8HP pumps for my recirc. I am however going to remove them for a pair of submersible pumps that I will put into my overflow. I am in the middle of a sump re-design and as part of it, I will be scaling back on my power bill while improving the system.. More flow, less power, better filtration etc. I have run these Wave Pond pumps for several years. They are great pumps. I keep spares on hand in case of a seal leak but other than that, I swear by them. One of my recircs also drives my Carbon and Phosphate reactors in addition to returning flow back to the tank.