Formalin is more toxic in soft, acidic water and also removes oxygen from water so vigorous aeration most be applied. Each 5mg of formalin removes 1 mg of dissolved oxygen from the water. Malachite green is also more toxic at low pH as well as high temperatures.Malachite green has two forms depending on pH. The initial strong green coloured for prevails at low pH (acidic), while in alkaline water it is converted to a colourless carbinol form.ormalin is more toxic in soft, acidic water and also removes oxygen from water so vigorous aeration most be applied. Each 5mg of formalin removes 1 mg of dissolved oxygen from the water. Malachite green is also more toxic at low pH as well as high temperatures.
Most animals require some system to excrete the waste products of metabolism from the body fluids. Kidneys are the major organs of the excretory systems of humans and other vertebrates, but several other kinds of excretory organs occur in other kinds of animals.
The excretory system is the system of an organism's body that performs the function of excretion, the bodily process of discharging wastes. The Excretory system is responsible for the elimination of wastes produced by homeostasis. There are several parts of the body that are involved in this process, such as sweat glands, the liver, the lungs and the kidney system. Every human has two kidneys. Each kidney is made up of three sections: the renal cortex, the renal medulla and the renal pelvis.