im not sure what is causing this. i noticed that the water in my sump was looking lower than usual so i added ro because i thought this was from evaporation. i wasnt sure why it was so low so i checked the top and noticed the water level is higher than usual. the only explanation is that the pump is pumping more than is my overflow is sending down. i checked the overflow and there is nothing obstructing flow. the weird thing is that this just started today. (or only noticed today). anyone have any suggestions?