Sludge Density Index is one of the important indicators to measure the influent of reverse osmosis system, and it is also the main means to check whether the effluent of pretreatment system meets the requirements of reverse osmosis influent. Its size is critical to the operating life of the reverse osmosis system. It characterizes the content of particles, colloids and other objects in the water that can block various water purification equipment. By measuring the SDI value, the corresponding water purification technology or equipment can be selected.
