Many products are manufactured specifically to periodically measure sludge and scum accumulation — or you could make your own. These devices can be used in septic tanks, flow equalization tanks, grease traps, recirculation tanks, pump tanks and even aerobic treatment units to evaluate the buildup of sludge and scum.
In the past, a “stick test” using a white rag or towel was often recommended, but professionals today have a variety of purpose-built tools to do the job. Some of the most common propriety brands are DipStick Pro (Environmental Biotech), Sludge Judge (Nasco Whirl-Pak) and TruCore (Sim/Tech Filter). This list is not
