Just M.
Google
Our visit was a fascinating peek inside a beautiful palace we'd walked past many times. On the first floor are some sort of administration offices, and a line for those forms to the left. On the right, a guard opened a glass door and directed us up several flights of stairs (no visible lift access) to the museum.
Access to the museum is only via tickets sold online, so I'd suggest doing that ahead of time. They have WIFI access QR code available which was a big help.
Inside the museum has many artifacts related to the history of the building and to clean, safe water for Buenos Aires. It also houses one of the world's most historically important cast-iron structures - that moved 72 million liters of clean water for the city!
New insights for me were that this site (plus the site of the current Fine Arts museum) once served the water needs of the city. But the palace is fundamentally hiding a giant secret: inside the beautiful structure are giant reservoir tanks at what was the highest point of the city, allowing clean water to flow via gravity to those who used it! I can't imagine a major city in the US making our water tanks beautiful on purpose....but BA certainly did.
There is a tour that allows access into one of the tanks, but we didn't take it, so no feedback on whether it was worth the fee. Otherwise the tanks are currently used as a secure vault/library of architecturual documents important to the city.
The palace structure is used for events as well as admin and the museum. Well worth it to have a wander in the museum if time permits, especially if you have an interest in how things worked historically.
Another fun fact, they had a process similar to our UL listing process (which is electricity not water) to evaluate the safety of water accessories (toilets, showers, faucets, bidet, etc.) that was housed here. Three samples had to be provided for evaluation and testing: one got destroyed in the process of evaluation, one was kept in the warehouse, and if successful one was marked and returned to the factory, approved for production. There are many samples on display that remain from that time and it is a bit of a fun curiosity to see them and try to figure out how they worked and if current versions are any different.