JB Weld. Make sure the surface (inside and outside) and the crack is clean and dry. Mix up some JB Weld and press it into the crack from both the inside and the outside. Be sure to spread a layer of JB Weld across the crack. You do not want the JB Weld to be just in the crack.
Let the JB Weld cure according to the package before reassembling and running water through it. I would give it a whole day if possible.
OR
If the crack is just on the tank itself, you can find just the tank online for around $50.
Here is one place i foound...
http://www.brandsonsale.com/hg-011942.html?ref=lexity&_vs=google&_vm=productsearch
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