The amount of chlorine needed to shock a pool depends on the size of the pool and the severity of the problem.

It is generally safe to let rainwater into a pool, but it can affect the water chemistry and may require additional chemical treatment.

It is not necessary to leave a pool pump running all night.

It is not necessarily bad for a pool pump to run all night, but it can be more energy-efficient to run it during the day.

A pool pump should be serviced at least once a year.

Shock should not be used as a replacement for regular chlorine treatment, but can be used to supplement it.

It is generally better to run a pool pump during the day, as sunlight can help to break down contaminants in the water.

It is recommended to shock a pool before it rains, as rain can introduce contaminants into the water.

It is not necessary to run the pool pump while swimming, but it is recommended to run it for at least 8 hours per day.

To keep a pool crystal clear, it is important to maintain proper water chemistry, keep the filter clean, and regularly skim and brush the pool.