In a 2013 Capri, your filtration is done by the circulation pump only. In Economy mode, during the heat cycles, the circulation pump will turn on if it is not on already from the timed circulation pump setting, and the heater will run for the duration of the cycle, or until the spa has reached the set temperature. Also during this time, your ozone will run.
In Standard mode, your spa will maintain the temperature you have it set at. Your circulation pump will also run its normal cycle.
There is very little benefit from using the heat cycles in a spa your size. If it was my spa, I would put the circulation time up to 12 hours and leave it in Standard mode. If the spa gets a lot of use, and you want more ozone and filtration, you can always bump that up to 24 hours.