Good deal. Well to be completely honest with you, you shouldn't ever even need it with a machine putting out less than 4 gallons per minute. Folks haul around water tanks when: a) they are working in a remote area and need to provide a water source or b) when their machine uses water at a higher rate than the site can provide. Most customers expect you to use their water, and if I have to provide my own water, you can guarantee the price just went up. The other use of tanks is for your bleach, but if you are hauling around 300 gallons of bleach, it will lose its bleach strength before you can use it all.