I am having weird test results with my spa - it uses bromine to sanitize.
I have a Taylor K-2006 Chlorine pool test kit with the FAS-DPD chlorine test. I recently purchased refill reagents so they aren't too old. With a 10mL sample for chlorine it takes 32 drops to neutralize from red/pink to clear. This would indicate a Bromine level of 32*.5*2.25=36 (the 2.25 is the multiplier to use for bromine - or so I have been told). I have been in the spa myself and I have survived and the water doesn't seem too abnormal. My skin does smell like bromine afterwards but not excessively so.
When I try to test the pH when I first put in a couple of drops and the sample turns orangey-yellow like pH is too low. But after putting in all five drops it turns a bright purple. My understanding is that high bromine/chlorine can screw up this test and cause the purple colour.
I am not sure why the bromine is so high. I have a tube dispenser for small bromine tablets that goes in my filter and I had this at its normal setting of slightly open - just like for the last nine years since I have owned the spa. Over the last few days I have shut this off completely so that there is no bromine exposed to the water to try to lower the bromine. The only difference is that the spa has not been used very frequently over the last couple of months.
Any advice on what I should do? Should I drain and refill? Are there any other options?