We have a put up & take down Sand N Sun pool we purchased at Wally World this summer. I've always used (past 2 years) chlorine tablets and ph plus and my pool has always looked great. Around the first of July I thought I had sand in my pool and much to my chagrin...it's alge. I vacuumed added a liquid alge fighter and for a week it was fine but it came back as fast as it went. I really want my pool to be clean, clean, clean before I take it down and put away for the winter, any suggestions? What is this BBB method I keep reading about? Jason, Pool Mom....HELP PLEASE.