Prevent algae before pool opening?


Well-known member
Jul 15, 2013
Every year, I open the pool in May. About a month before opening, the pool turns green and I have a 1-2 week fight getting it crystal clear after I open. Is there anything I can do to prevent this? A little chlorine or algaecide pre-opening?


Well-known member
May 2, 2011
lebanon tn
You can start circulating water and add fc as if opening. With the GDP method fc is what kills algae. And an early start may stop it before it gets a hold in your pool. Remember to brush walls also

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
The formula for opening is simple really - the sooner the better. While the water may still be chilly, the sooner you increase the FC level (and confirm other levels) to begin circulation/cleaning the better. Adding an algaecide after the water has begun to change color would be useless, and depending upon the algaecide used, could cause more problems later (copper). Open early, start water circulation, and adjust chemicals so the water can bounce-back is your best bet. :)