Remove the fixed container option, 

when using the intermediate module, to allow multiple instance of sass() when watching different directories, without duplication of the input and output.

Example of gulpfile.js with different directories watched:

    gulp.task('sass', function() {
      return gulp.src(SASS_DIR_1)
             .pipe(sass())
             .pipe(gulp.dest(CSS_DIR_1));
    });
    gulp.task('sass', function() {
      return gulp.src(SASS_DIR_2)
             .pipe(sass())
             .pipe(gulp.dest(CSS_DIR_2));
    });

**The issue:**

The output of CSS_DIR_1 is duplicated in CSS_DIR_2, and vice versa.

Regards