The pool guy, at my request vacuumed the pool, finding what he believed to be live algae. He believes we need to continue to shock the pool. He also agreed that it appears that most of the "heavy leaves/twigs/and other stuff has been removed, leaving lots of algae. His solution to the algae is shocking to clear the water then vacuuming. In the meantime, I have ordered the tf 100 kit from TFtestkits.net. I will change the pool sand, and clean the inside of the Triton filter.Thanks one and all for your help, and support.