The 4 Millenium class ships have this pool outside of the spa area so they don't charge. The older ships have it inside the spa and thus charge $10/day to use it. I personally have a problem with paying the same amount that I tip all the service people for an entire day as one has to pay just to use this pool.
The thelasotherapy pool is a sort of giant hot tub . There are massage "stations" around the pool that give you a nice relaxing massage using water. Frankly the ones on the Millenium class ships are not much more than big heated swimming pools.
The ones one Galaxy, Century and Mercury are a real treat. It is like getting a spa treatment for $10. We bought 14 days worth on Mercury for a discounted price and used it every day before going down to get dreesed for dinner. It was fabulous.
On Summit we skipped it as it was not much more than a giant hot tub or heated pool.
The T pools on the Millennium class ships are heated salt water, with the 2 sides fitted with area you can lounge on with air jets, very soothing after a long day on shore. The hot tubs are also heated salt water. They all are inside so it is very calm and quieter than being out pool side. We loved it, just got back from Milly cruise yesteray. You can also set up having a pool side message.
Thanks! I'll have to give it a shot for $10 on Galaxy. If it was nothing more than a hot tub then no I would not bother but since you state the ones on Galaxy are good it would be nice after a long day on shore.
We used the T pools a couple of times on the Constellation a few weeks ago. I loved it, thought it was quite a bit more than a giant hot tub, in fact there were 2 hot tubs in the same area. Would I pay $10 I don't know, but thought the experience was awesome.
I loved the T-pool on the Millennium (free) but found it noisy at the spa pool on Galaxy @ $10 a day. Whereas the Galaxy pool is within the spa area it is much smaller and voices tend to echo off of the walls. In the domed pool area on the Millennium, there is soothing classical music and many padded lounges to relax in with the sun pouring through the glass. The water is laced with minerals and lots of salt and chlorene, so don't wear your best swim suit. I like the "water beds" in Millie's T-pool also. It is much larger than the Galaxy's. Can't wait to enjoy it again in February.
We used the T pool on the Infinity. It was nice, but don't think I'd pay $10 per day for it. The best part (maybe because it was free) was that hardly anyone used the area. That made it truly relaxing. That area was definitely away from the crowds.