Something else to consider is that a 6.0 or 6.7 Metre Minuet's graywater tank only collects waste water from the kitchen sink and bathroom vanity as the tank is mounted on top of the floor in the bottom of the streetside rear wardrobe (I haven't thought to ask owners of 7.4 Metre Minuets about the location of the graywater tanks on the largest Minuets). Some Minuet owners have added a graywater tank below the floor that collects just the shower waste water, but I am not familiar with the details of how this modification was accomplished.
Kevin D. Allen
WBCCI (Lifetime Member)/VAC/Free Wheelers #6359
1964 Overlander International/1999 GMC K2500 Suburban (7400 VORTEC/4.11 Differentials)
1978 Argosy Minuet 6.0 Metre/1975 Cadillac Eldorado Convertible (8.2 Liter V8/2.70 Final Drive)