The acid waste must pass through a properly constructed and acceptable _______ before entering the house sewer.

The requirement for acid waste to pass through a properly constructed and acceptable neutralizing pit before entering the house sewer ensures that the acidic content is neutralized to a safe pH level. Acid waste can be detrimental to plumbing systems and municipal wastewater treatment processes due to its corrosive properties. A neutralizing pit typically contains materials such as limestone or other alkaline substances that react with the acid, thereby raising the pH of the waste to a non-corrosive level. This is crucial for protecting the integrity of the sewer system and for preventing potential hazards in wastewater treatment facilities.

Other choices, while related to waste management, do not serve the specific purpose of handling acid waste in the same capacity. A sewer trap primarily functions to prevent sewer gases from entering a building, a filtration system aids in removing particulate matter but does not neutralize acidity, and a grease trap is designed to capture fats, oils, and grease from the wastewater. Therefore, the neutralizing pit is the most suitable and effective means of managing acid waste before it enters the sewer system.