I have a chelsee model, and was wondering if the circulation pump is the same thing as the primary filtration? On the smart tub app, they only show primary and secondary filtration, and I am trying to understand how this works as I was told in the winter, you want the circulation pump to run all the time? Does that mean I would set the primary filtration to 24 hours?? Also, what is the secondary filtration for. Any help in clarifying would be appreciated.