This requirement is for 2 volumetric dry screw feeder systems , soda ash at 5-10 lbs. per hour to be installed at well 4 and well 6 to replace the existing soda ash mixers. The systems are required to... This requirement is for 2 volumetric dry screw feeder systems , soda ash at 5-10 lbs. per hour to be installed at well 4 and well 6 to replace the existing soda ash mixers. The systems are required to replace the existing soda ash mixers at the base water treatment facilities located at Well 4 and Well 6. The new systems will provide accurate and automated dosing of soda ash for water treatment and is estimated to save up to 100 man hours per month.