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.
TECHNICAL NOTES ON DRINKING-WATER, SANITATION AND HYGIENE IN EMERGENCIES 11.3 Measuring chlorine levels in water supplies b a b c b a a Figure 11.2. Steps in determining the chlorine residual in water using a comparator The amount of chlorine residual changes during the day and night. Assuming the pipe network is under pressure all the time (see Box 11.4)