You can’t understand the operation of your pool, unless you also understand the function of the weir.

So, let’s define it.

A weir is the suction point where water is removed from the pool as it enters the filter system. This is the position where the pool cleaner hose is plugged in. The weir also prevents the debris that’s been collected from floating back into your pool.

How does it do that when the pump is switched off?

When the pump is shut off, the suction obviously stops, so the weir floats into a vertical position, which prevents debris from floating back into the pool.

Some skimmers don’t have this type of weir and use a floating barrel as part of the skimmer basket. The basket collects leaves and larger pieces of debris, allowing you to remove them easily.

See? Simple!