[steve the plumb]

Bill you are better off placing the tank downstairs and then testing for leaks there.If you dismantle and move stuff around more than likely something that didn't leak the first time around may leak after you have moved it.I would place the tank in the basement where is going to stay.Fill the tank 2 or 3 inches as well as the sump(height of the bulkheads)This way check all the bulkheads first.Leave it for 2 or 3 days then fill it to the height where water goes into your cl.Test your cl lines for any leaks.leave it for another day and check for leaks if your good add a bit more water and start up your cl pumps.If all your bulkheads are good you should be fine.the return lines usually don't leak.I don't know how you are planning to take everything apart.This is why I said test in the basement .If you have unions everywhere then you can unscrew them and you are fine.Unions aren't cheap.