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.
Unless your pool is made of concrete, chlorine should never be added directly to the water. If it comes in direct contact with the walls or bottom it may damage materials such as fiberglass or plastic. A general rule you can follow when adding chlorine is 1/2 ounce for every 500 gallons of water on a weekly basis. If you have a 1,000 gallon pool an ounce a week should be enough to effectively sanitize the water. Because there are many factors that affect the amount of free available chlorine in the water, you need to test the pool on a regular basis.