Jar tests may be also performed to determine the chemical dosage for phosphorus
11 removal in atypical applications (unusual wastewater composition, etc.) and to assess alkalinity
12 destruction and pH depression from dosing of aluminum-based chemicals (as well as iron-based
13 chemicals). Jar testing will also aid in determining requirements for supplemental alkalinity
14 addition that may be necessary to maintain the required pH for nitrification. See also Section 6.3
15 for discussion of pH and alkalinity impacts. Jar test results may be only an approximation of the
16 dose requirements and the chemical’s impact on pH, as many aspects of the full scale,
17 continuous chemical addition may not be well duplicated in jar tests. However, jar tests are well
18 suited for a comparative testing of efficiency and costs of alternative chemicals (see also Section
19 4.6). Due to the inherent variability of wastewater, it is advisable to repeat jar tests on several
20 different samples.