Hi wondering if anyone could point me in right direction, I have a 15x30 pool with an AA in floor cleaning system I just bought the house it has a 1 hp Hayward pump which doesn't seem to be working well , if I open the valve for just the skimmer it moves the water to skimmer basket OK, if I switch it to floor vent it draws in water OK as well but if I place it to do both there is no movement of water in skimmer basket. It has a Hayward cartridge filter about 4 foot tall I have cleaned filter several times and doesn't make a difference. I have a pressure meter and it is reading about 30 so I don't know if why it doesn't work when I switch it to both vents Cant find any numbers on it. I am planning on adding solar heat to it so I will need to replace pump was also thinking of replacing cartridge filter to sand filter, not sure if there is something wrong with my pump but figured I have to change it anyway to add solar panels to it. Any help on pump size I should be looking at? Any help would be appreciated.