Port Washington UFSD / Port Washington School District
Apr 10, 2017 · Diatomaceous Earth Filtration. 219 §64651.30. Direct Filtration Treatment. 220 §64651.32. Disinfectant Contact Time. 220 §64651.33. Disinfection. 220 ... Premises where substances harmful to health are handled under pressure in a manner which could permit their entry into the public water system. This includes chemical or biological process ... ................
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