I do not have a greywater system and am new to this site but I had to chime in and offer something for consideration. I use a paste made from mustard powder and water. Mustard powder has antibacterial properties and will also act as a fertilizer and pest repellent so I think it would be great for greywater systems! It's the best degreaser I have ever used for dishes. Scrape/wipe debris, then I put the paste onto a scrubby sponge and rub all the dishes with it, then rinse them all at once. It's great for deodorizing too, I love it for water bottles etc, put some in with warm water and swish, or rub hands with the paste to deodorize after handling garlic, peppers, etc. If you have a particularly greasy pan, sprinkle the powder on and let it sit while you do the other dishes. You can use it to clean wool and silk too. I sprinkled some on an oil spill on my car upholstery and them vacuumed it up, worked better than baking soda!
