Sewage treatment units are normally designed for A. 5 – 10 years B. 15 – 20 years C. 30 – 40 years D. 40 – 50 years

The correct answer is: A. 5 – 10 years.

Sewage treatment units are designed to last for a period of 5 to 10 years. However, the actual lifespan of a sewage treatment unit will depend on a number of factors, including the quality of the unit, the frequency of use, and the level of maintenance.

Sewage treatment units that are not properly maintained will have a shorter lifespan. It is important to follow the manufacturer’s instructions for use and maintenance to ensure that your sewage treatment unit lasts as long as possible.

If you are unsure about how to maintain your sewage treatment unit, you should contact the manufacturer or a qualified technician for assistance.

Here is a brief explanation of each option:

• Option A: 5 – 10 years. This is the most common lifespan for a sewage treatment unit.
• Option B: 15 – 20 years. This is a longer lifespan than option A, but it is not the norm.
• Option C: 30 – 40 years. This is a very long lifespan for a sewage treatment unit. It is possible for a unit to last this long, but it is not common.
• Option D: 40 – 50 years. This is an extremely long lifespan for a sewage treatment unit. It is very unlikely that a unit will last this long.