tecman, Nautique is also a 9% chelated Cu compound as is Cutrine Plus, Some of the other posts may have covered this but I prefer Sonar in our midwestern and northern waters for pond weed,(small leaf, bushey etc) if you were referring to this family of weed and not pond (plants) weeds in general. Sonar (floridone) is difficult if you irrigate so consider that one along with what is down stream if applicable.Chara and some of the other listed algae can be a problem in clear deep or shallow water, UV inhibitors can help in deeper waters but do little in the shallows, Dyes in general may conflict with some of the other things you want to accomplish with your pond.I also believe plants and algae develop resistance to same mode of action chemistries so rotation of mode helps also, Good Luck Ted
