With the big rain we had today (about 3 inches) and the trace amounts we got a week earlier our tanks are now filled with 4500 gallons of water. I am so impressed! Plus I have more water stored in my tubs which I placed on the other side of the house (which we did not gutter yet) and that is worth another 100 gallons or so. I will be watering with rain water for quite some time to come.