So I have an intex saltwater spa. Had 1.5 fc and 1ppm of combined chlorine. I used the Taylor 2006 kit which measures both. Also have roughly cya of 20. So I added a lot of chlorine free oxidizer. Prob 30 ounces instead of the 2-4 the bottle said because I wanted to break the combined chlorine. The guy at leslies said you technically can’t add too much oxidizer. But today when I checked it, my free chlorine was like at 20ppm! Why would a chlorine free oxidizer shoot up my chlorine level? The guy at leslies even said the maximum level the chlorine would go up to would be whatever the test kit said the combined level was which was 1.5 because that is in essence all the chlorine that is in the spa. So what am I missing here?!