more_vert

What is the meaning of(draining the water down) from the book(TREATMENT OF WATER—DESIGN AND OPERATION CONTROL) the Complete sentence is:

(This is done by draining the water down to

6 in. below the surface of the sand bed and scraping about 1 in.)
thumb_up_off_alt 1 positivo thumb_down_off_alt 0 negativos

Por favor, ingresa o regístrate para responder a esta pregunta.

...