Whisperflo 1hp for 13.5k gallon pool

That is a bigger pump than you need, unless you have high flow rate requirements.

A 1HP 2 speed Superflo is a better fit assuming you have 230v power available.

Something wrong with your existing pump?
 
If you have the typical high California electricity rates your best choice is likely to be one of the smaller variable speed pumps, like the Hayward MaxFlo VS or something similar. This is assuming you don't have a spa, large water feature, or automation system, any one of which would steer things in a different direction.
 
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