OWT classification data

I am currently wondering if there is a way to use Landsat 7/8 data in the OWT classification tool. I read the topic on senitnel 2 data, concerning the missing wavelenghts in the reflectance after c2rcc. For landsat 8 I get only 5 bands for rhow_ and therefore the missing wavelangth error when trying to run OWT. So can I just use old Meris or senitel 3 imagery?
Thanks for any advice,

OWT processing is not possible with Landsat, because it does not provide the required wavelengths.
In general the OWT is sensor independent, but it needs certain wavelengths. The wavelengths are differen on the selected OWT type. The wavelengths are listed in the help.