Filter tank for removing algae from raw water

The utility model provides a filter tank for removing algae from raw water, a water inlet channel and a drainage channel are arranged beside the filter tank, water in the water inlet channel enters the filter tank through overflow, and an activated carbon filter layer and a quartz sand filter layer positioned below the activated carbon filter layer are arranged in the filter tank. A drain pipe and a backwashing air inlet pipe are arranged below the quartz sand filter layer; the rear section of the backwashing air inlet pipe is transversely arranged at the lower part of the filter tank; a chlorinator and an activated carbon dispenser are arranged above the filter tank, the chlorinator is transversely mounted on one side, close to the water inlet channel, of the filter tank, the activated carbon dispenser is mounted on a slide rail trolley, and the slide rail trolley walks on two slide rails. The device has the beneficial effects that the chlorinator is arranged on one side of the water inlet channel, so that a