I have recently bought a 52" tall 15x30 above groung pool . The store sold me a proline 2hp 2spd (upgrade from a 1.5 1 spd) with a 22" sand filter the takes 150lbs of sand. My installer states I need to have a 300lb filter because the back pressure will be too much for the small filter they are supplying me with? I brought this to the stores attention and they do not offer a 300lb filter. The sales guy has never had an issue and of course he has the same pool at home?? They are also telling me to keep it on low 24/7?? Please give me some direction . Do I go back to a 1 1/2 hp or keep what I have . I am installing this as a inground I am hard piping it and vermiculiting the bottom and also installing the a center drain.