I can answer some questions, but I'll need help with a few.

It's a built in hot tub, inside it's own room.

I don't know if it shares filtration and pumps with the pool. The previous owner did mention something about using water back and forth between the pool and the hot tub. There's only one large tank outside where the sand filter is.

Chlorine was used it it. The only thing left with it were Spa pH up and Spa pH down, and an unlabled white container with a green lid. All chemical bottles look fairly old.

I don't know how to tell if it has a ozonatoror an ionizer.

It's acrylic.

The dimesions are 7' 3" x 7' 3", edge of cover to egde of cover. There is a lounge on one side and 4 seats on the other.