From Designing Spaces Television Show

Penguin "No Overflow" Toilet demonstration

If a blockage occurs and the toilet clogs up, water continues to rise until it reaches the primary overflow holes. At this point, the water drains through the secondary system bypassing the main trap and drains directly into the sanitary main.

In the unlikely event that the primary overflow holes are obstructed, the water then continues to rise to a hidden channel inside of the toilet, once again protecting from an overflow. This amazing system offers 2 means of protection against overflow!

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With every flush of the toilet, the secondary drain is jetted with water to maintain sanitary conditions.

In the unlikely event that the primary overflow holes are obstructed, the water then continues to rise to a hidden channel inside of the toilet, once again protecting from an overflow. This amazing system offers 2 means of protection against overflow!