Super Soil

i just made a batch of super soil for my outdoor plants and was wondering if you could use sunshine ultra coir as the base i was going to make another batch soon for indoor and was wanting to know what u guys think of using it a the base instead of roots organic

If it's washed it should be fine. Be aware that, unless you find a recipe for supersoil calling for straight coir/peat, you will need to add more amendments than the recipe calls for, as most recipes i have seen are based on pre-amended mixes.