What is the difference between the Porto Moniz Natural Pools and the Cachalote Pools?

Both are incredible, formed by volcanic lava. The Porto Moniz Bathing Complex is an enclosed space (with a very affordable entrance ticket), calmer waters, changing rooms, lockers, and lifeguards – ideal for families.
The Old Pools (Cachalote) are free to access, more rustic, without supporting infrastructure, perfect for those seeking a more natural experience and photos without many people.
Read here the full article about it.