Went ahead and took a reading of salt in the pool water BEFORE adding any salt. It was 400 ppm. Pool calc based on 21,000 gal. came up with 525Lbs. Added 520 When I ran the water through the Taylor test I got a result of 3200. I thought I was golden until I went over to the SWG and hit the salt shaker icon it read 4.3g/l. Who's right? Before I start emptying out 23% of the pool. Manual advises upper limit of 3500.