If you notice a slight loss of water pressure when you turn on the faucet Tuesday, don’t worry. It’s all due to the city’s plans to shut down the tank located at South 8th Street and Ave. U west of South Elementary School so contractors can clean the tank’s interior.“This is a routine maintenance project,” said Dionicio Garza, Jr., city utilities supervisor. “We take it down to do interior cleaning. We do this in all the storage tanks through the system.”The city has four other tanks supplying water to customers: N 6th and Ave. M; S. 3rd and Lynn Ave;