Fill comes in two general types: splash and film.
Splash fill consists of wood or plastic bars in various shapes, supported in a fixed spacing and orientation, usually using a wire or fiberglass grid. Ceramic bricks are another type of splash fill. For each splash fill, we check the condition of the splash bars themselves. We look for sagging, broken, or decaying splash bars or excessive buildup of scale, as well as for fallen or misplaced splash bars. We check the coating on steel grids, the condition of the welds on stainless wire grids, and the general condition of fiberglass grids.
Film fill consists of multiple parallel formed sheets, either hung in the tower or resting on fixed support members. We check for buildup of scale, algae, or other contaminants on the surface of the sheets. We also check for erosion, sagging, torn sheets, or evidence of ice damage and the condition of support members.