Amortization (paying off the capital) of rainwater tanks with the Water Rhapsody Grand Opus is best done by filling and emptying the rainwater tank/s as often as possible. As many times as any rainwater tank/s can possibly fill from rainwater from roofs, these should be drawn down to empty to avoid them overflowing next time rain should fall. Overflowing tanks mean that there is not enough rainwater storage in place or not enough people to consume water in the house. Rainwater tanks that never fill mean that too much storage has been put into place, or that there are too many people drawing from this water.
