The retains for both lots of S-50 have been retested and found to meet spec.
I have attached the methods for % basicity and sulfate.
% basicity for Sumalchlor 50 is not a direct test but must be calculated using aluminum and chloride content.
% Sulfate is a limit test not an assay.
The next step if necessary is to have samples of the material tested by IA Chemicals to our US location for testing.