It doesn’t look like much but a new treatment plant along Moffat Boulevard at Garfield Avenue behind a wrought iron fence is helping Manteca water users save nearly $500,000 a year.The mini treatment plant is part of a city strategy to comply with increased treatment costs due to stricter federal arsenic removal standards without triggering a water rate increase. The strategy involves blending surface with ground water wherever possible.The Moffat treatment plant is where the water from three municipal wells - one behind the Powers Avenue fire station, another near the Carl’s Jr. distribution center in the Manteca Industrial Park and a third near Grant Street - will go for processing through one arsenic treatment plant instead of three separate plants at the various locations. After it is treated it will be funneled into the city’s drinking water system.