Fiber Clear products should be put into the skimmer, just as you do with D.E. It is not necessary to mix Fiber Clear with water before putting it into the skimmer. Just pour the required amount (depending on size and type of filter, as noted on the package) into the skimmer with the pool pump running. Instructions for the amount of Fiber Clear to be used with the various size filters are on each bag. A Fiber Clear scoop is included in each bag, except for the 9 oz. size which serves as its own measure.