clorar

To chlorinate — to add chlorine to water for disinfection, most commonly clorar una piscina (to chlorinate a pool) or clorar el agua potable (to chlorinate drinking water). A technical but not rare verb, familiar to anyone who's maintained a pool.

• Hay que clorar la piscina una vez por semana. — You need to chlorinate the pool once a week.
• La planta municipal clora el agua antes de distribuirla. — The municipal plant chlorinates the water before distributing it.
• Cloraron el agua del pozo tras la inundación. — They chlorinated the well water after the flood.

Clorar specifically means to add chlorine, not to disinfect in general — use desinfectar for cleaning that doesn't involve chlorine.

Often confused with desinfectar.