I've been doing this for a week now and today I noticed many, many new leaves sprouting all over it.
I am glad. I was afraid it was dying. Well, I guess it was dying.
What makes this an unsanitary set up is that the grey water and black water (for the toilet) share an outlet hose. I have the black water tank closed and I only have to empty it once a month. It will be simple to hook the hose back up to the septic outlet for that chore. The bacteria that does escape out on to the soil when I disconnect it again probably won't live very long. After all, it is supposed to be 100 degrees here tomorrow. They say that grey water shouldn't be used for fruit trees. I suppose that is because fruit can fall on the ground and get dirty. My Mesquite will be a shade tree when it grows up so I don't see a problem.
I fastened a crude cover for the drain out of window screen so that nothing can decide to crawl up it.
I keep all the plugs for the inside drains closed just in case. I suppose ants could still get up the drain if they really wanted to. When the temps get over 100 critters start getting desperate for water. Who knows what they will do.
Anyway, that is my desperate attempt to revive my baby tree. I bought these trees through my local electric company. They have a program which provides shade trees at a discount rate to help lower electric bills. My Desert Willow and Ironwood are doing well with the occasional bucket of laundry water. I can't wait to see what color my Desert Willow flowers are. Maybe in a month it will give me a clue. Whatever permanent habitation I end up putting on my property, whether it be site built, manufactured, or just rehabing the old mobile home, I definitely want to have a grey water system so that I can grow my own desert oasis with very little water.