Since no one has posted, here's my two cents: After reading the forum, I decided to run my pump on a 6 hour on/off cycle. I do that unless I shock than I run it all day and then start my on/off cycle again. I haven't had any problems. I only have a no frills single speed pump. Don't know how a 2 speed may be affected by on/off cycling, but that's what I do with my single speed pump