I jumped in the thousand gallon tank yesterday
morning to give it a good scrubbing, the only maintenance it has
received in months.
We get our drinking water from a well, but we use the creek for most of
our other water needs. Most folks who don't connect to city water
install a pressure tank, but we've found that a gravity system is
simpler and requires very little electricity.
When the tank gets low every month or two, we turn on the pump
for a few hours and top the water off. After that, gravity pushes
the water to the house to fill our sink, bathtub, washing machine, and chicken waterers.
We started out with a little 50 gallon tank on a tower by the house,
but we used up the water awfully quickly and were disappointed by the
pressure. A thousand gallon tank slightly uphill gives us much
better water pressure, approximately equal to what you'd get from city
water.