1.  As they do best if the water is aerated only half fill the aquarium.

2.  To help minimise problems a ball airstone powered by a Hoffman pump has been introduced to aerate the water.

3.  Deason has designed a series of ponds and limestone spillways to aerate the water and raise its pH from acid to alkaline until the dissolved metals drop out.

4.  One way to help keep a pond healthy is to aerate the water.

5.  Some models spray the returning water in flamboyant fountains, aerating the water and creating an impressive display.

6.  That process of aerating sewage water is one of the cheapest and most effective ways of cleaning it, Rickey said.

7.  The system aerates the water in a modern-day version of Villa Lante, the ornate Renaissance water garden in Viterbo, Italy.