How to choose the water chiller?

When using the water chiller, it depends on whether you are cooling directly or indirectly.

Direct cooling is to put water directly into the water chiller, and then freeze the water to cool the seafood. 

The effect will be better.

And indirect cooling is to put water into the basin, place a small basin above the basin, then cooling the seafood in the small basin. 

Therefore, the effect will be worse.