aquatic (by 2 people)

detergents (by 2 people)

surfactants (by 2 people)

algae (by 1 person)

aquatics (by 1 person)

bacteria (by 1 person)

biology (by 1 person)

detergens (by 1 person)

ecology (by 1 person)

ecosystems (by 1 person)

ecotoxicology (by 1 person)

freshwater (by 1 person)

higher plants (by 1 person)

invertebrates (by 1 person)

leeches (by 1 person)

marine (by 1 person)

mollusks (by 1 person)

organisms (by 1 person)

pollutants (by 1 person)

pollution (by 1 person)

toxic effects (by 1 person)

toxicity (by 1 person)

toxicology (by 1 person)

water quality (by 1 person)

water self-purification (by 1 person)