blug-green water

[joe]

i have a pool in an apartment complex and my pool water is clear when it is closed but as soon as i open it it turns green then a blue-green color my ph is 7.8 and my chlorine is at 3.0 and no mater how much i shock it and put copper algaecide and majestic blue calairifier it is still a blue green color that just gets wors what can i do someone please help me