Serial filtration 2. 0 um as specified in Standard Methods for the TSS test More than 20 mg/L of additional TSS would have been measured Electronic Particle size Counting Diluted sample through a calibrated orifice. The conductivity is correlated to the size of an equivalent spI here Fig. 2-5 Volume fraction of particle sizes found in the effluent from two activated-sludge plants with clarifiers having different side water depths However, the particle size data for the large particles are quite different, owing primarily to the design and operation of the secondary clarificationSerial Filtration 2.0 μm as specified in Standard Methods for the TSS test. More than 20 mg/L of additional TSS would have been measured. Electronic Particle Size Counting Diluted sample through a calibrated orifice . The conductivity is correlated to the size of an equivalent sphere. Fig. 2-5 Volume fraction of particle sizes found in the effluent from two activated-sludge plants with clarifiers having different side water depths However, the particle size data for the large particles are quite different, owing primarily to the design and operation of the secondary clarification