Use Ball Valves Instead of Gate or Slide Valves in Gravity Filtration Systems.
Are you using (or do you intend to use) a Gravity Filtration system? If so, use Ball Valves instead of Gate or Slide Valves. Gate or Slide Valves cause too much resistance, which significantly reduces the flow in the pipe. One Gate or Slide Valve can cause as much resistance as three Ball Valves.