I am planning on replacing my pump, pretty sure its too big

[leena]

Here is another combo, also a 2 speed pump, also a Hayward but with a larger sand filter....21" versus the 18" above. This confuses me as before we talked of sand filters as being 200lbs, etc so not sure why it tell the inches rather than lbs of sand? Im assuming I want my sand filter to be the correct size for my pump or do I go by the size of my pool?

http://www.amazon.com/dp/B002HHM020/...P89FGH0U&psc=1

[leena]

now here are 2 pumps that are 2 speed and only 1hp so would this be better? Would that mean on low it would only be 1/2hp? One is a Hayward for approx. $275 the other is Blue Wave for approx. $175. IS the Hayward better quality or are they practically the same thing?

http://www.amazon.com/dp/B00212NNU4/...=IPBL5VSUIDVO8

http://www.amazon.com/dp/B00ITPPS6E/...P8VM63AB&psc=1