I have already added this 20% algaecide from Wal-mart, and should have waited til I read more here. I am understanging from what I have read it will be ok as long as it's not copper based. Well, now I am in a panic trying to figure out if the **** is copper based... I have searched all the ingredients and haven't had any luck. Can someone just tell me if it is copper or not. Alkyl(50%c14 40% c12 10% c16) dimethly benzyl ammonium chloride 20%....What the heck??!! Help!!