Well for me I am turning the water over more often than is necessary. My current pump flows 3600gph and the Whisperflo on low speed will flow 2100gph. I have a 15,000 gallon pool so on low my pool is turned over every 7 hrs or so whereas with my current pump it's turned over every 4hrs. I run my pump for 12hrs per day. I see no reason to turn my water over 3 times a day. It's a huge expense for nothing. The nice thing is if I want higher flow I simply flip a switch but for the most part I'm saving money and have less mechanical noise in the process.