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.
In some applications such as the manufacturing of fresh-cut produce, many regulations stipulate that free chlorine must be applied to the water at a concentration greater than 50 mg/L. 1  Such levels are known as superchlorination.