suggested timer

1. Intermatic T104 (assuming your pump is 230V, T101 if it is 115V). They are bulletproof. Make sure to get the outdoor enclosure if it will be exposed to weather. Google them ;)
2. Does not really matter. Run when power is cheaper or whenever is convenient, knowing that the pump should be on for 30-60 minutes before you test and after you add chemicals. Often good to run in a few short periods throughout the day.
 
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.