This model was inspired by the trays a turtle or tortoise could use to get in and out of water. This has been printed and tested and is holding water for me. If there is any concern for growth in the layer lines there are aquatic safe coatings that can be used to seal the print. This doesn't have to be used for water can also be used as a humidity bowl for moss to hold moisture or for food. Number of things it can help with in your pets tank. No more worried about them getting stuck in the water bowl textured surface for easy grip to get out.