According to the removing rate on algae and cost value or so, the sequence of four algaecides from good to bad were potassium permanganate, copper sulfate, hydrogen peroxide and sodium hypochlorite.
The reaction conditions of 2-ethoxybenzoic acid were optimized by changing the amount of diethyl sulfate, reaction time of methyl salicylate and potassium hydroxide, the amount of sodium hydroxide.