Liquid coagulant that improves the filtration process of pool water by restoring its clarity and making it cleaner. Specifically, it is a chemical compound that, when added to the water, effectively removes contamination elements that the filter failed to trap, such as dust, algae, spores, insects, and pollution loads from swimmers. The best effectiveness of the coagulant is achieved with its proper use and in the correct feeding quantities, and mainly, through a feeding pump.