So... I was away for two months and upon my return I am seeing some stubborn algae clinging to several areas in the bottom of the indoor pool. Never had it this bad before (Thanks, pool sub guy!) I have been brushing repeatedly (from the deck with a nylon brush), but it doesn't seem to remove it. I have raised the bromine level to 10 ppm a few times, but this doesn't help either. Will raising the bromine level higher help.... or do I need to get in the pool and try to remove it by hand scrubbing? What the heck is going to get this green stuff out of the pool? It's kind of hard to see from the photos, but there is definitely stubborn algae clinging to the bottom of the pool.