The toilet drain is the same as the sink drainage

It's not the same. One pipe diameter 100, one pipe diameter 50 or even less. One has no trap and one has a trap.

The defrosting water in the refrigeration room should be discharged from the water outlet at the back, sometimes it may cause food residues to fall into the inside and cause blockage, and the defrosting water can not be discharged outward, it will produce the refrigerated room to flow outward, if you find that the water is stagnant in the drainage tank, please pay attention to see if the water outlet is blocked, dredge it with a perforated pin or soft plastic parts, etc., to see if the water is discharged smoothly, and you can use a small amount of water to flush it after discharge. If you use a perforated pin to dredge still not pass, you can also find a longer plastic strip (or other things that have both toughness and hardness) to dredge, the length of the drainage banquet late pipe is 1 meter on the left Jingyan right, and it is best to poke a little deep Li Li.