another black algea problem

[aylad]

I've not had to deal with black algae, but I would go ahead and lower the pH to the 7.2-7.4 range and stick with bleach. What is the active ingredient in the algae guard?

Janet

[CarlD]

Unless the ingredient is "Poly....<something really long>..." 60% or 30%, (which we call PolyQuat) then do NOT USE the algaecide. PolyQuat is the only good one and it's better for prevention than cure.

[kingcoota]

Here are the active ingredients of Super algea guard

Active Ingredients
Alkyl dimethyl benzyl ammonium chloride, 30%
Alkyl ethylbenzyl ammonium chloride, 30%
The remaining parts are inert ingredients, 40%

[Watermom]

Nope. Don't use it.

The only algaecide we recommend is Polyquat 60% --- ingredients will say: poly [oxyethylene (dimethyliminio) ethylene (dimethyliminio) ethylene dichloride]