When installing, you can choose to combine two or four fiberglass plastic grille covers with a tree shaped hole in the middle, and the grille is connected to the grille through fasteners or screws, making installation simple and maintenance convenient. There is a relative gap between the edge of the fiberglass grating cover and the pool wall. Note that the middle tree hole is slightly larger, as the tree still needs to grow. The bottom of the fiberglass grating cover should be truly leveled. Due to the sinking of the new tree hole, it is necessary to check the filling material in a timely manner to prevent the lid from sagging. After installation, please make sure to be parallel to the sidewalk floor to prevent pedestrians from tripping while walking. The fiberglass grating cover is not prone to irreversible bending. In addition, the quality of fiberglass is relatively light. The quality of the grille made of this material is about 1/4 of the original steel grille, which greatly reduces the cost of the sewage treatment system. Economic development is certainly important, but it cannot be taken seriously in eliminating subsequent development. In this case, the current development is also unable to connect. Therefore, we must protect various environments. In sewage treatment, materials such as glass fiber reinforced plastic grilles should be selected. More and more fiberglass grilles are being accepted by the building materials market, and the number of customers is also increasing.