Underneath the fire pit (surrounded by Barcelona Teak chairs from Via Terra), an underground concrete cistern holds rainwater, diverted from pipes on the roof that run through a filtration system in the garage. It services the whole house, save for the landscape irrigation, done off of a well. In a part of the country where water is scarce, it was important to think sustainably. The pool’s fully retractable cover prevents rapid evaporation in another water-friendly move.