Pool Perfect is an enzyme product designed to break down oils more quickly than chlorine is able to break them down. It is kind of a specialty item, as you really only need it if you spill an entire bottle of cooking oil, or worse motor oil, in the pool or several people who swim in your pool really like to use lots and lots of suntan lotion.
Pool Perfect is often sold in a single bottle combined with PhosFREE, which is designed to remove phosphates, although it is also sold separately. We do not recommend using PhosFREE. But Pool Prefect can be very handy if you have the exact problem it is designed to solve.