This is a Spa + Pool, the Spa spills over into the pool as a waterfall.
It feels like I have tried every direction and the only thing I can do is basically drain the Spa into the pool. The pool has 1 drain the the Spa has 2 drains. As far as I can tell, in "spa mode" 1 drain is used to circulate water to only keep that hot. If that makes sense, I'm not sure. The other drain I'd assume is used to help circulate water with the pool but that I'm unsure of

The filter is a cartridge filter. The old owners left the manuals to everything, so I have already been able to take apart the assembly to see how it works and put it together.

*Note - I am pretty handy with taking things apart and putting them back together correctly, if not in a better way. Goes along with my job.