Hi Laura,

In my house we use PureWash, an oxone treatment for laundry that doesn’t require any detergent. It is a bit pricey at first, but it works with cold water only, and no detergent, so you see on-going energy and detergent savings for the life of the system. https://www.greentechenv.com/laundry/

Other than that, there are detergent alternatives, like soap nuts.

I don’t have experience with Tru Earth but I just looked at the website and ingredients and it seems fine to me. I would try it!