The natural rehabilitation of an anthropogenically acidified tropical Lake: Two decades of monitoring

► Natural rehabilitation of an acidified Lake was monitored during two decades. ► pH, conductivity, sulphate, iron and toxicity of the water were monthly recorded. ► Toxicity levels were related to Lake pH values which ranged with rain and dry regime. ► Moving average approach using pH data showed clearly the Lake recovery process. ► Recent data highlight Lake rehabilitation and the efficiency of the containment plan.