Water Ballast Pollution
Water Ballast Drawbacks
Lead, Concrete and Water are ballasts commonly used in the marine industry; each has serious drawbacks which have been well documented.
"Using water as ballast for empty or part-laden ships is not a new development having been in use for more than 200 years. Ballast is not just used to adjust draught but also to help trim to enable safe and efficient operation of ships under a variety of conditions including cargo shift and water ingress. Few of those that were innovative enough to make use of water instead of solid ballast could have thought that their idea was later to be considered as ecologically unsound."
(Excerpted from "Ballast Water Regulation - A Brief Overview" by Malcolm Latarce, shipinsight.com)