I am finding it very confusing to decide just how much waste water capacity I have and if and how they work together. I believe I have 2 gray tanks, 1 for the shower and bath sink and 1 for the kitchen sink. I believe these gray tanks are both 52 gallons each and I hope they equalize for a total of 104 as shown in the literature. These dump out of 1 gray waste valve which is in the Nautilus System compartment. Also located in the Nautilus compartment is the 52 gallon black tank valve for the main bath. I do not have the 1/2 bath but do have the washer/dryer connections so I assume that I have a 2nd 52 gallon black/gray tank with a separate dump valve by the back wheel. Is that right? If not, please feel free to set me straight!