Need a little boost?¬† This Water Brick Water Seat is what you are looking for.¬† It is designed to give you up to a 4" lift to make that deep seat not so deep.¬† It is designed to be filled with washed gravel to weight the pillow down. ¬† Directions: Locate the zipper on the water seat. Unzip and remove the included vinyl pouch. The pouch includes 3 resealable compartments. Fill these compartments with washed pea gravel or marbles and close. Place the filled vinyl puch back into the water seat and zip closed. Place the water seat in your spa nd allow time for the air to escape from the water seat.¬† The water seat will sink within a short time. Place water seat in your favorite seat in your spa and relax.