Over the past fifteen years, there have been many improvements in low flow toilet design and technology. At Levy and Son we make it our business to stay up-to-date on advancements made in the low flow plumbing field.
Toilets that are hard to flush or that clog on a frequent basis may be the victims of poor trapway design. The trapway can be defined as the hole where the water exits the bowl. The bends within the trapway may be too tight or the actual interior size of the trapway may be small.
Here are a few of the things you may want to consider when choosing the right low-flow toilet for your home:
- Trapway size – Size does matter! A small trapway can cause unnecessary blockages. There are toilets on the market with trapways that measure 2 ¼ inches or better. Get at least one that is a minimum of 2 inches!
- Glazing – Almost all toilets have a nice shiny glazed finish. However, some manufacturers cut corners in this area. The lack of glazing in the trapway can result in turbulence and reduced flushing capacity.
- Flush design – In the case of gravity-flush toilets, there are two different systems to choose from. In the siphon-jet system a jet of water adjacent to the trapway pushes the waste into the drain. In a slotted rim system, water exits the tank through slots underneath the rim of the bowl, creating a vortex, and forcing the waste down the trapway. The slotted rim system can be managed and cleaned more easily than the siphon-jet system.
A few examples of the better systems available:
- KOHLER toilets feature a 2-inch trapway and are fully glazed. That means they can pass an object the size of a softball.
- TOTO toilets feature 1 7/8” to 2 1/8” trapway and are Fully Glazed. They even offer insulated tanks on gravity feed systems. Trap seals are 2 ¼” to 3” – depending on the model.
- AMERICAN STANDARD makes the Champion which has a trapway of 2 3/8” and comes Fully Glazed. The trap seal is 3 inches! (Sizes vary with the manufacturer).
When looking to purchase a new toilet, it is important to do your homework. You will be using this toilet many times a day over many, many years! It deserves a little effort in choosing the right one for you. When purchasing a new toilet, remember: the toilet should have a TWO INCH minimum trapway and be FULLY GLAZED.