they can be installed on concrete gound in foundry workshop,  withour pit or special foundations construction work . The low level range is also very compact in design and can fit into small areas inside or outside of the foundry.
The top deck, which made by special material, HARDOX steel, The surface hardness is usually 360 ~ 450HB. Second layer of the perforated steel plate use same material of the first deck, prolong service time to several years, then sand goes third layer of attrition unit, special material of wedge wire mesh.
The final filtering layer is stainless mesh to separate the impurity and discharge.