Judy,

Yeah, I still run the pump for normal maintenance and filtering.....greatly reduced because of low chlorine demand and little, if any, use.

If I had a 2-speed, I'd probably try what you're currently doing (24/7) and see if that doesn't keep it clean. Since I don't, I try to run mine a few hours at least every other day but, generally, I simply eyeball the condition of the water and run it when it looks like it needs it.