The SludgeKing dewatering roll-off box from Park Process has sidewall filters that form a radius at the bottom, leaving a rounded turn, not a 90-degree angle. The rounded shape helps prohibit cake from sticking while dumping. The filter media and support panels terminate horizontally on the floor, leaving the filter media and the tie-down bracket sticking up about a 1/2 inch from the floor. In this void between the center wall filters and the wall filters are installed UHMW plates that fill the volume with plastic, so no water can stand in the bottom. This material is used in dump trucks to help facilitate dumping and in the unit it performs the same function. It also incorporates two center wall filter panels to get even more surface area of filter per unit volume, equating to faster drainage rates and drier cake. The design is available in roll-off-type dewatering containers or permanently mounted on a tipping stand. 855/511-7275; www.parkprocess.com