How can oxygen be put back into water? What will be an ideal ...

[ENagel]

How can oxygen be put back into water?
 
  What will be an ideal response?

Question 2

When does the loss of oxygen occur most often?
 
  What will be an ideal response?

[sarah_brady415]

Answer to Question 1

Mechanical aerators can be used to put oxygen back into water. These devices sling
water into the air where oxygen becomes mixed with the water.

Answer to Question 2

Loss of oxygen occurs most often during hot, dark nights when plants in the water are
not giving off oxygen.

[ENagel]

Gracias!

[bblaney]

Thanks for the timely response, appreciate it