Do I need to pre-dissolve YELLOW OUT® before adding it to my vinyl liner pool?
It is NOT necessary because YELLOW OUT® has nothing in it that will bleach or discolor a vinyl liner. However, if you feel more comfortable pre-dissolving it, that's fine. Just mix it with warm water in a bucket and then pour it into your pool. Remember, never mix any chemicals together in a bucket and always rinse the bucket out after each use..