treatment of gray water for domestic reuse

[alaska bush]

I am planning to use a composting toilet at my cabin. Since I am very close to salt water I would like to treat my gray water so that I may re-use it for domestic use and for watering my garden. I also want to be sure I do everything I can do to treat the gray water prior to disposing of any water which is not reused.

Are there any plans or reference books available which I can use to help me construct a system to treat this gray water?

Thanks for any suggestions