青云翻译

It can be seen from Figure 4, the filter layer to remove the iron filtration rate improve little impact.

You can see from Figure 4, iron filter removal by filtration rate increase has little effect.

May see by Figure 4, the filter bed elimination iron the influence which is enhanced the rate of percolation is not big.

It can be seen from Figure 4, the filter layer to remove iron from the filter as soon as possible.

You can see from Figure 4, iron filter removal by filtration rate increase has little effect.