The Brass Cauldron
is used for brewing potions
Brewing potions in a Brass Cauldron reduces the time you need to wait for certain potions to finish brewing.
A Brass Cauldron can be bought from Potage's Cauldron Shop for 21 Galleons.
The Brass Cauldron is the second fastest and second slowest Cauldron currently. You do not need this since the School Cauldron is the Pewter Cauldron.
Pottermore at Playstation Home
On Pottermore at Playstation Home, Brass Cauldron, Size 2 is the 1st Pottermore Card in the Equipment category.