The two independent, parallel CMP WWT systems are each configured as indicated in Fig. 2. Slurry waste flowing from CMP tools in the cleanroom first accumulates in the slurry lift tank. When this tank fills, the liquid is pumped through a series of filters. The first filter is the “pre-filter,” and consists of a steel drum containing a polyester “bag filter” and is intended to remove large sediments (15 μm pores).