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 effectiveness of chlorine is controlled by pH, temperature, contact time, and dose. Neutral pH (6.5 to 7.5) produces the maximum amount of hypochlorous acid. If the pH of the water is too low (pH < 6.0), chlorine will escape as a gas, decreasing effectiveness and increasing equipment corrosion.