6 Season
44 Episode
The Best of Ask This Old House: 44 Common Household Projects - Season 2 Episode 4 Installing a Water-saving Toilet
Richard replaces an old 3.5 gallons per flush (GPF) toilet with a new, state-of-the-art dual-flushing unit that uses 0.9 GPF for liquids and 1.6 GPF for solids.