meinpa

I have been using bromine for 13 years and not had this issue, it has actually worked very well for us in NW Ohio. My alkalinity, ph and hardness are all in the good range. What other test should I have done on the water?

I can't keep my bromine level up in my 18X33 above ground pool. My water is clear, my alkalinity and ph are in the good range. I have a in line bromine feeder and have it on high, I also use borate and the levels are good for that as well. I heavily shocked it 48 hours ago and my bromine level is near zero this evening. I used 10 bags of good Chlorine shock and my levels was sky high but came down fast yesterday and today. I have no idea what is burning up my bromine nor how to correct it. I have had the pool 13 years and never had this issue. I did have some light brown dust stuff on the bottom of my pool but I have vacuumed it a few times and that is now gone. I really could use some easy helpfull suggestions.