Consider the following statements in respect of aerated grit chamber:1. The grit accumulates at the bottom in advancing spiral-flow aeration tanks location ally preceded by grit chambers, led to the eventual development of aerate grit chambers.2. The excessive wear on grit handling equipment is a major factor for the popularity of aerated grit chambers.3. Aerated grit chambers are designed to provide detention period of 1 minute at maximum rate of flow.4. Diffusers are located at 0.45 m to 0.6 m above the bottom of the chamber.Which of the above statements are correct?

Consider the following statements in respect of aerated grit chamber:1

1.	Consider the following statements in respect of aerated grit chamber:1. The grit accumulates at the bottom in advancing spiral-flow aeration tanks location ally preceded by grit chambers, led to the eventual development of aerate grit chambers.2. The excessive wear on grit handling equipment is a major factor for the popularity of aerated grit chambers.3. Aerated grit chambers are designed to provide detention period of 1 minute at maximum rate of flow.4. Diffusers are located at 0.45 m to 0.6 m above the bottom of the chamber.Which of the above statements are correct?
A.	1, 2 and 3 only
B.	3 and 4 only
C.	1, 2 and 4 only
D.	1, 2, 3 and 4
Answer» D. 1, 2, 3 and 4