While spaying is traditionally recommended for kitties between 4 and 6 months of age, spaying as young as 8 weeks old is considered safe, according to Cat Channel.
The national drinking water standards state that the maximum residual amount of chlorine is 4 mg/L. Untill recently the USA used chlorine gas extensively for wastewater treatment. Today, the use of chlorine has been forced back.
The brain-eating amoeba is unable to enter the brain through other means of ingestion, including drinking the water or an open sore or wound. Advice from the Australian government's scientists is what led the state to begin ordering drinking water systems to maintain levels of chlorine at .5 milligrams per liter.