Robert Stephen Morton
Vincent. By your description the installation doesnt comply with any standard, the retention times are fare more than normal making the grey water black.
Check with the local authority & get a Licensed Plumber to carry out any repairs, alternativly accept the smell but be prepared for litigation should any person catch any desease from your black water dispersion, remember that the growth of desease resistant strains of super bug will be enhanced in your situation.
Bob
