Anyone know what this is? I have no picture unfortunatly. Friends of mine have just bought a 17 century farmhouse in essex which has a rectangular brick lined 'pool' (no water currently) in the front garden. It also has some steps leading down into it at one end. It resembles a shallow swimming pool or Roman bath. I've seen one other, or rather two others next to each other in front if a house in Norton Mandeville Essex. It was also next door to a from. Any ideas why these were used for? I've googled for the last hour nf can find no pictures of anything similar.