I'm considering opening my in ground pool within the next few weeks before the green stuff gets a chance to grow. Current temps are highs in the 50s and 60s with lows in the 40s and 50s. It does not appear that we will have any more hard freezes below 30. I live in NW Arkansas. Any advice? When do most folks open their pools in the south? I have usually opened in May and have to fight algae for two weeks.