Specifications include, but are not limited to: ACH 40% - Aluminum Chlorohydrate @ a concentration of 40% Delivered Size: 2900 Lbs. Estimated Annual Qty: 145,000. ACH is a water treatment chemical used to coagulate particulate solids in water or wastewater. ACH changes the electrical charge of the particulate solids causing them to attract and form larger solids that can be removed from water. It’s color can range from colorless to slightly yellow. The actual percent concentration of Aluminum Chlorohydrate (ACH) shall be 40%. (Aluminum Chlorohydrate @ 40% concentration) The City of Chandler anticipates approximately 145,000 pounds of Aluminum Chlorohydrate (ACH) to be delivered annually. Pricing for ACH shall be based on a per pound basis and shall be inclusive of delivery to specified location.