- May 28, 2011
- 10
trying to close my pool for season and added an entire gallon jug of chlorine early today to start the shock process but am still getting a '0' FC test reading now 6 hours later even though the pump/filter has been running the entire time. 18K gallon pool and water is maybe 50 F. Do I need to wait longer to test, use some sort of shock product instead or what?