We have found in most instances, that anytime there is an imbalance in the pool water, you can sometimes get scale, which can be perceived as fading. This thin, white layer can be removed with some elbow grease and the proper cleaners. It’s more noticeable on some of the darker colors. First, follow our general cleaning guidelines. If a deeper clean is needed, you can use a calcium, lime and rust cleaner or a strong tile cleaner.