Tried some Aquathol 191 and that didn't work very well....that is when I thought it was coontail.
AQUATHOL K? Or HYDROTHOL 191 (liquid)? They're similar, yet very different products.
As for posting bullet-points on management options; that's sorta risky since each pond possesses different variables that factor into a customized management strategy.
I have a PDF form which helps reduce the time spent playing the "20-questions game". The completed form provides me with the basic/preliminary info that's needed for assessing the variables found within most types of ponds and lakes.
Shoot me an email (my address is on my profile) and I'll return the form to you for completion - no cost involved. THEN, we can either dialog by email or phone to determine the most plausible approach for managing the weed problem after considering your pond's specific circumstances.