max totoToto Ultramax has a consumption of 1.6 gallons per flush, using Toto’s G-Max flushing system. Toto Ultramax II, as we have seen, is more water efficient, using only 1.28Toto Tip: TOTO has always been an industry leader in green technology. TOTO currently offers a number of products that meet the new California Green Buildings Standards Code (known as