I know you said bigger is better, but is it possible to get it too big? I read one review of the pump Im getting and it said that low was so low that they weren't even able to use it on low. This would defeat my whole purpose for purchasing a 2 speed. However, Im not sure I understand how it all works so the sand filter may not have anything to do with the pump being able to be run on low..? Here are 2 larger sand filters, a 250lb and 300lb. IT would cost me like $36 more to go with the 250lb and $46 dollars more for the 300lb so Im willing to do it if you are sure they will still work with that 1hp pump on low.........

http://www.amazon.com/dp/B000EXWL46/...4FFX3WT8&psc=1

http://www.amazon.com/dp/B000EY39QY/...I259WSJIDLW747