I have spent the last week turning a green pool blue and would not have pulled it off without the patience and help from Craig and his staff. They taught me how to backwash, how to check and change the suction and every other day I would bring them water samples and they would give me detailed instructions on what to do next. One week later and success! After two other pool guys quit and caused this problem and the last one insisted it needed a new filter and the third tried to drain it in 115 degree weather - which ps you can't do when it's over 90 degrees!