Dear Joe. Thank you very much for your attention to this question.The objective is to explore which is the opinion of experts on the topic in order to design an experiment to determine if rapid sand filtration preceded by good coagulation - floculation - sedimentation stages is capable of retaining small particles (

Dear Joe. Thank you very much for your attention to this question.The objective is to explore which is the opinion of experts on the topic in order to design an experiment to determine if rapid sand filtration preceded by good coagulation - floculation - sedimentation stages is capable of retaining small particles (<0.5µ) and challenge this vs the DBP's rule that aims to remove DOC which is <0.45µ particles. If the current filtration technique used around the world even when using enhanced coagulation is not capable to remove <0.5µ particles then we can conclude that this technique dated back to 1900 is obsolete and that is time to look for another options for TTHM control.