I have been brushing my pool about 3 times a day, but I always brush it right BEFORE I add chlorine. So while the chlorine is not real low when I brush, it is a little bit lower than what I have been trying to keep it at.
My pump is a 1.5hp motor connected to a 200lb sand filter. But it is a two speed pump, so I run it on low when filtering and on high when backwashing. Each morning when I go out to check on my pool, the water flow coming back into the pool is very low, so I have been doing a backwash each day. That tells me that the sand filter must be picking up something, right? Also, I replaced the sand in my filter this year also.

Thanks for the help

Tim