Open a package of aquatic fertilizer tablets and insert one into the end of a fertilizer rod.
Walk out to where the water lilies are located in the pond, using hip waders if needed.
Push the end of the fertilizer rod into the water directly next to the stem of the lily until you feel it touch the bottom of the pond. Push it down another 2 inches into the soil and squeeze the lever on top of the rod to release the fertilizer tablet.
Raise the fertilizer rod out of the pond water and insert a new tablet into the bottom. Insert the second fertilizer tablet into the soil on the opposite side of the water lily just as you did the first one. Repeat the process to fertilize all remaining lilies.
Repeat the fertilizing procedure at least once per month from spring through the fall, however every two weeks is optimal to achieve the most blooms.