Some turbidity can have particles too small or very few particles to make turbidity hard to see with just the human eye. Some types of matter suspended in water are small pieces of soil, sewage, industrial waste, and microorganisms. Living organisms such as plants and animals add to the amount of turbidity in the water. Many human activities around bodies of water increase turbidity, such as people using water to dump garbage and to dispose of waste from sewage systems. Boats that might skim the bottom or the sides of waterways will cause more sediment in these waters.
Some turbidity can mean that there are harmful contaminants in the water.
Waters with a high level of turbidity will loose ability to support aquatic life. Total solids mean all solid matter is either suspended or dissolved. Dissolved solids cannot be separated from water by sedimentation or flocculation. Solubility is the ability of a substance to dissolve in another substance. This is a hard question to answer.