masterplumber
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Debit, I use a 5 gallon container under my sink for gray water. As long as you're careful to only use biodegradable soap etc...it is safe and actually more responsible to dump it on vegetation to water it. Just don't keep dumping it in the same place all the time - spread it around. There are times when you can't dump it on the ground, like in some campgrounds. But I find that with careful use my 5 gallon tank will hold 2 weeks worth of gray water. That is when using 20 gallons of clean water in the same time period.
And congratulations on the new van! Be careful about what you choose to run for fuel. You can get away with used veggie oil if you filter it well, but I'm not sure going the route Low Tech uses will work for you. He has an all mechanical military engine that was made to run on many different grades of fuel. Yours is a computer controlled engine with narrow operating perimeters. Also be aware that most people who run veggie fuel also start and stop their diesels on diesel fuel, making sure to run it long enough to clear the lines of veggie fuel. You'll also need a heat exchanger in the veggie oil tank run of the engines cooling system. Vegetable oil gels at a higher temperature that diesel fuel, something like 50 degrees or so. So you have to warm it up and keep it wrm to keep it flowing. It's not as simple as just dumping veggie oil in the tank and going. For your first season in the new van I would just run diesel fuel and concentrate on making a comfortable home out of it. If the funds and time allow later you can always revisit the idea when you have time to fully research it. Best wishes.
And congratulations on the new van! Be careful about what you choose to run for fuel. You can get away with used veggie oil if you filter it well, but I'm not sure going the route Low Tech uses will work for you. He has an all mechanical military engine that was made to run on many different grades of fuel. Yours is a computer controlled engine with narrow operating perimeters. Also be aware that most people who run veggie fuel also start and stop their diesels on diesel fuel, making sure to run it long enough to clear the lines of veggie fuel. You'll also need a heat exchanger in the veggie oil tank run of the engines cooling system. Vegetable oil gels at a higher temperature that diesel fuel, something like 50 degrees or so. So you have to warm it up and keep it wrm to keep it flowing. It's not as simple as just dumping veggie oil in the tank and going. For your first season in the new van I would just run diesel fuel and concentrate on making a comfortable home out of it. If the funds and time allow later you can always revisit the idea when you have time to fully research it. Best wishes.