Hi there. Matt from Shelby Township, MI. 2nd owner of 30k gal inground vinyl liner salt water pool. Been here 8 years now. Pool is about 15 years old. New liner, pump, and SWG circuit board last year. New salt cell 4 years ago. Never had too much trouble maintaining chemistry, until this year. SWG is not producing chlorine. Came here to try to figure it out.