Avoid, avoid, avoid
Using eco eggs or similar results in clothes not getting clean and a mouldy, smelly washing machine.
I tried them years ago and it resulted in the mould in the machine making DD's eczema eorse, and a very stinky machine.
Washine powders containing bleach not only clean your clothes, they clean your washer and kill off bacteria and mould as well.
Eco eggs are a terrible idea.