Nicole,
Before you go out and spend money on a pump replacement, is your pump and filter a matched unit? Some of Astral pool products are and they do have a matched unit of a 1.5 HP pump and 150 lbs filter so I suspect that it is a matched unit. If so, it would seem unlikely that they would pair a pump with a filter that would cause damage. So you may not need to replace the pump.
Also, is this for an above ground pool? What is your pressure guage on the filter currently reading? From this you can determine the feet of head your current pump is experiencing and then more accurately calculate the GPM.
If you do decide on a new pump, with 7500 gallons, you need only need 16 GPM for an 8 hour turnover. Not much at all. You could use the smallest pump available (1/2 HP) or better yet a two speed pump and operate on low speed most of the time. Even most 1/2 HP pumps will provide more than 40 GPM between 45-65 feet of head so it may be better to go with a two speed pump.
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