Methodology (3) Attention (3) Atención (3) Metodología (3) Costa Rica (2) Sewage--Purification (2) Quality of products (2) Health (2) Salud (2) Estudio (2) Calidad (2) Datos (2) Aguas residuales--Tratamiento (2) Programs (1) Certification (1) Winds (1) Water (1) Towers (1) Temperature (1) Sewage (1) Sanitation (1) Radiation (1) Laxatives (1) Proportion (1) Pollution (1) Pollutants (1) Perception (1) Matter (1) Magnesium (1) Loading and unloading (1)