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.
Chromium (VI) considered to be a most toxic metal/element if present in drinking water. In drinking water its concentration should be as low as 2 microgram/ litre but concentration as high as 120 microgram/ litre also reported.