Yesterday, we drained and refilled our Marquis Promise. We have in-line bromine, with an ozonator. This morning we found light brown gunk in the filters, and in the bottom of the tub. We took a sample in a plastic bag, and there is no odor.
We drained after about eleven weeks, because we were having trouble balancing water chemistry. Last Wednesday Marquis analyzed a sample. Bromine at 5PPM. We recently added a solar blanket, and bromine has has been running from 5-10PPM. We've had this tub for three years and have had high bromine before. PH was 7.8 and Alkalinity 40. Because PH was running high and Alkalinity low, we opted to refill rather than try and balance it with Spa Up, etc. Hardness was 60. We are using City water, which is soft, and we have a chlorine and sediment filter at the main line.
We called Marquis and they said they'd never heard of such a thing, had no suggestions, and had no way to analyze the gunk. For lack of any better idea, we cleaned up the filters and the gunk in tub, and added new bromine/mineral cartridges . Bromine is now reading at 1 PPM, and we are in the process of bringing down the PH/Alkalinity.
Any insights would be appreciated, since we were unable to get any information from Marquis.