My solution to the zebra mussels clogging up the drainage pipes is to install Teflon or plastic liners, thereby making it difficult for them to attach to said pipes. On Navy ships this would be a great benefit to the various sea chests located on the bottom of every ship. With funding a study can be made to see which plastic works best under various conditions and also allows for chemical changes to be made to the plastic that will not be harmful to other marine life. City and town drainage systems would also benefit.