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Please Help, My Bromine Level Keeps Dropping


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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.
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bromine does not do well in outdoor pools because ti cannot be stabilzied effectively against loss from sunlight like chlorine can. Without further information and a full set of test results I would guess that is your problem.

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First "in good range" tells us nothing. We need test results numbers! For bromine please post total bromine, pH, and TA (Calcium hardness is not important for vinyl pools unless it is very high--above about 400 ppm--and then you need to keep close tabs on pH and TA to prevent scaling or cloudy water).

If your bromine level is not holding it is most likely one of two things:

1. The bromine is being destroyed by UV light from the sun

2. There is something 'growing' (usually algae) that is consuming the bromine.

Another possibility, IF you are testing bromine with DPD (color comparator with shades of red) is that the bromine is actually very high and is bleaching out the test (a downside to DPD testing, which is why FAD-DPD testing is usually recommended). What are you testing the water with? Strips are not reliable at all, btw.

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