We've owned an Endless swim spa for over 7 years. We routinely maintained the pool with bromine tabs, shocking occasionally with liquid chlorine bleach. Recently (this summer) we noticed a precipitate forming that settles at the bottom of the pool after shocking. We did change brands of bromine and attributed the change to the new bromine tabs. We've since drained, re-filled, and went back to our old supplier of bromine tabs. Unfortunately I'm already seeing some of the same globules settling to the bottom of the pool. Any thoughts on what this is? How we can mitigate it? Thanks in advance for any help!