求翻译：3) 过滤器有两种安装方式，见图5～6，但应注意水流方向不可弄错，安装时应尽量使水力控制阀处于水平位置或向下的位置，以保证排污彻底。是什么意思？

3) there are two filters installed, as shown in Figure 5~6, but should pay attention to direction of flow is not a mistake, the installation should be as far as possible, hydraulic control value in the horizontal or downward position, to ensure that the sewage and complete.

3) there are two filters installed, as shown in Figure 5~6, but should pay attention to direction of flow%2