physan 20 has 9% of Alkyl* dimethyl benzyl ammonium chloride
consan 20 is 10% Alkyl* dimethyl benzyl ammonium chloride
HTH pool algaecide is 15% Alkyl* dimethyl benzyl ammonium chloride
Find out what the percent of Alkyl* dimethyl benzyl ammonium chloride is in the stuff you are interested in before you start dunking your plants in it.
Phyton 27 is copper based which you can find copper based super algae killer for pools also. Can turn things blue that you might not like blued.
I use the liquid copper for any active crapola for instant contact kills and I use consan 20 once a month for prevention so I dont have to use too much copper.
these items you can find listed here
PAN Pesticide Database