Do you have to put the plugs back once you fill an in-pool product with water?

Yes, after you fill the product with water we recommend inserting the plugs in order for all of the water to remain in the product. Use a large, flat head screwdriver to screw the plugs back into all open holes on the product. Make sure the plug is lining up straight with the threads in the holes. Once they are securely fastened, your product is ready to use.