I have algae forming on the bottom of my pool can't seem to get rid of it. I've tried brushing it and running the filter longer. My chlorine has been fluctuating from very low to high, not sure why. The last time it was low I ran a boost cycle on my SWG. I think this is why the algae started forming in the first place. Is this safe for my kids to swim in? How can i get rid of the algae I have?