Very authentic place to swim. Always 36deg. You should bring your towel, swimsuit + bag for wet items. Too crowded in summer, very good in October-November or February-March
A great place to spend time. The ruins of the old town are impressive. It can be seen that the restoration and restoration of facilities is really underway.
Next to the pool, there is a museum complex at the exit, where you can see some of the household and ritual objects used by the ancients, as well as funerary monuments.
The pool itself is good with slightly carbonated water, clear and airy.
But, unfortunately, all this is for a fee (commerce rules). Of the inconveniences, there are a lot of people, you need to take care of your feet, as there is a high probability of hitting your knees or knocking your feet against fallen columns inside the pool.
There are lockers for changing clothes, showers (very cold compared to the pool water), toilets.
And it all looks great from a balloon.
In a word: look, you won't regret it.
The pool itself is quite small, there are enough people there. In general, there is a lot to see in Herculaneum, and this place is the center of attraction for tourists. The water is really warm, as there are underground springs everywhere. The bottom of the pool is problematic. There are transverse obstacles in the form of columns about which you can bruise your knees or injure yourself. An open-air museum and salt terraces are within walking distance. Take water with you, it's not superfluous under the scorching sun. Enjoy your stay!