Slotted and Unslotted Basin Wastes: What Is the Difference Between Them?

Slotted basin wastes have a slot that permits any overflowing water to drain safely into the main waste. In case your basin has an overflow, you’ll need to buy a slotted basin waste. That brings us to the question, What is a basin overflow?

A basin overflow is a tiny hole just below the top of your basin through which water runs out when your basin gets too full. This practical design is convenient, as it prevents bathroom flooding.

If your basin does not have an overflow, you’ll need to buy an unslotted basin waste. This waste is easy to install and maintain. But it will not allow any water that flowed through the overflow to return into the waste pipe. So if your basin has an overflow, you should never buy an unslotted basin waste.