1.   Ammonia is the toxic waste produced by the fish and this is initially bacterially broken down to nitrite in your filtration system.

2.   At Basle, environmentalists also called for stricter regulations on facilities for disposal of toxic waste in importing countries.

3.   Companies must call a halt to the dumping of toxic waste at sea.

4.   Exercise great caution when handling toxic waste.

5.   Greenpeace claim that toxic waste has been dumped surreptitiously on west coast beaches.

6.   He does a similarly good job on energy, with some sobering figures on inefficiency and the build-up of toxic waste.

7.   In London, two skips and six barrels full of toxic waste blocked the front entrance to the environment building.

8.   In many regions, industry is permitted to connect up to the domestic sewage system to discharge its toxic waste.

9.   Indeed, they see incineration as a solution to toxic waste whose usefulness should be employed on a greater range of materials.