Thank you for your time and advice. I am a fairly new pool owner. Recently, I have been having a hard time with my pool. My pool is a 10,000 gallon in ground pool. My pool has visible green algae/dirt and sand. My PH is high 7.8-8 or higher. I have no chlorine at all. I was wonder should I backwash my DE filter first. Lower the PH. Then shock my pool? I only have calcium hypochlorite shock. Thank you.