We have a 1.2 surface acre pond with a max depth of 9'-10'. We bought the property about 2 years ago, it was very neglected, overgrowth of trees etc. and same with the pond, by August it will be 100% covered with watermeal and some duckweed. We are located in Kansas. PH is neutral at around 7.0 when I last checked it. I did buy 7 grass carp to help with the natural approach as well as took out several trees blocking the wind from keeping the water agitated. We have done two treatments with Tsunami DQ and the recommended surfactant as the container suggested at the heaviest coverage rate. I applied at the first sight of watermeal and duckweed and when the water temp was getting warm. I mixed in a 40 gallon sprayer loaded it up in the boat and treated all edges where the watermeal and duckweed collected so far. I treated again in 4 weeks. This barely put a dent in the growth of the watermeal or duckweed. Some areas were killed by it but most were not, only discolored to a light green or in some cases yellow. The dead areas turned brown. After contacting Sanco Ind. (who has awesome service and cant say enough good about them) I was instructed to apply at much heavier ratios than what you would deduce from the label. That being said I was not going to spend the $120 and up per gallon to treat at the rates I was referenced. After the second treatment 3 weeks later the watermeal and duckweed was in full force. Another month it was taken over again. At which point is too late for herbicide treatments due to cost and potential impact to environment fish etc.

So now to my questions:
I do not intend to use Tsunami DQ based on my past experience and level of overtake that watermeal and duckweed has on our pond. I am considering Clipper or Diuron. I had purchased some Clipper last year after the second treatment but did not use due to not knowing if it could be used in combination with the Diquat based Tsunami DQ and due to the fact that by the time I got the Clipper the duckweed and watermeal were establish too well. Can anyone weigh in on this?

Additionally, Diuron is used by some local folks. What are the rates that someone could recommend and can it be used in combination with Clipper? Based on my reading of Diuron 80DF's information 2 PPM is the max application which is 25 kg per Hectare-Metre. If I assume that our pond has an average depth of 3 ft (~1 m) then we would have .5 hectare-meters. This would put us at ~12g can anyone confirm this? I would prefer to start at the conservative side so would rather consider doing around 6 kg or less. Anyone guidance would be appreciated.

Thank you in advance.

Once our water temps hit 50-55 I am planning on treating our pond. So please let me know what your best experience has been to knock out and infested pond early prior to the duckweed and watermeal taking over by late spring or early summer. Also if you have had experience with Clipper or Diuron please advise.