When space is limited or the tank is overloaded, one way to solve this problem is lamella plate clarifier is installed to reduce the hydraulic load rate by increasing the surface Area, while maintaining a constant flow rate. In the lamella flat plate clarifier, the surface area increases By installing a series of inclined plates (at an angle of 400-600) until The vertical depth is 2m and the interval is 40-120 mm. Surface area is the number Multiply the number of plates by the surface area of the plates. The sedimented sludge falls on the bottom of the sludge tank. The flake clarifier increases the effective surface area by 6 to 12 times Compared with traditional tanks, reducing the angle will also increase the surface area, But the effect of sludge slipping from the slab. Counter-current design is best for the entrance At the bottom of the plate, then rise to the top. A variation of the Lamella clarifier is Pipe settler. Both designs can be retrofitted into existing tanks. The figure shows Schematic diagram of the Lamella clarifier.