The firm has no use for dual-flush toilets, Stuhr says. Instead, he and his colleagues favor those offering a single efficient flush, such as Kohler's Cimarron 1.28-gallons-per-flush toilet tank. The Water Sense-certified unit uses the manufacturer's Class Six canister technology, which it says results in smooth flushing with consistent water usage. It comes in six colors. Kohler Co., 800.456.4537; www.kohler.com.
jeffrey stuhr, assoc. aia, and john t. holmes, aia