The soap issue is impostant regarding how you plan to use the greywater. For example if you plan to use the water for the garden you need to be concerned about salts in the detergent. Most detergents contain salt which is bad for plants. Even some of the eco friendly detergents. Safer to use soap nuts which is a nut from a tree that produces saponin, a soap type susbtance.
It isn't so much the soap, but the borates and chlorines used, I switched to Shaklee Basic L, which has a washing soda base, and my kids' skin looks better, plus it goes a long way!
The percentage of soap in the water is so miniscule it really doesn't make a difference, especially if you're economic with the amount you use-you don't need much soap to do the dishes if you use it properly.
You may find your garden to be more lush and green. Jerry Baker recommends using dish liquid as a surfactant so fertilizers work better.. YOur garden might have fewer harmful insects... I wouldnt use wash water with chorine bleach on my garden. It might kill the plants..
Best of luck
It's been my experience that most people who care enough for the environment to use gray water also use biodegradable laundry soaps, or at the very least a home made laundry soap that has far less chemicals in it than most did 20 years ago.
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