Toward Ecosophy

This is variable with where you live, and it's important to take local conditions into account. Here, we've done a lot of greywater experimentation and never had a problem with salt (I can just about mulch the garden with fresh seaweed and not have a problem)... BUT our soil is so sandy that "sandy" seems like a joke-- it's really just sand-- and we get like 80 inches of rain/yr, so any salts leach out very very quickly (along with all the soil organic matter, compost, nutrients, and every other thing the garden needs!). But I imagine if you lived anywhere arid, or with poorly-draining soil, you'd want to be very careful about it.