Barreno Avila, E. M.; Córdova Suárez, M. A.; Vargas López, J. H.; Calderón Valdiviezo, M. D. Water Hyacinth (Eichhornia Crassipes (Mart.) Solms) and Water Duckweed. (Lemna Spp.) to Reduce the Hardness of Irrigation Water. CCD 2020, 3, 133-146.