Before I contact my spa builder, I wanted to do a bit of sleuthing on my own to determine if I likely have a water leak in my in-ground saltwater spa (2,200 gal.). Since the spa was built & filled about 4 months ago, I have been adding about 10 lbs. of salt every 2 weeks to maintain a level of 3,200 ppm. It didn't occur to me until recently that I might have a underground water leak that triggered the autofill, thereby decreasing the salt level. Keep in mind that my wife & I use the spa once or twice weekly & there is no splash-out. Also, the spa has an auto cover that is in place except when the spa is being used. There are no visible leaks in any of the above-ground equipment or plumbing.
So for the past 2 days, I shut off the auto fill. The the pump runs 3 hours daily for general filtration & chlorine generation. After 48 hours, there has been no reduction is the water level in the spa. Thinking that the leak might only occur while the pump is running, I manually turned on the pump a couple of hours ago & will let is run continuously for at least 24 hours to see if the water level falls. Are there any other suggestions of things I might check to narrow the cause of the problem?
Thank you for any thoughts & suggestions you might have. I truly appreciate your expertise.