Hi Roger Mcburney,  When ...

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Hi Roger Mcburney, 

When doing my master thesis in 1990 using Alumimum Sulphate for fluoride removal in Tanzania I took samples for test at the Technical University in Denmark for residual Aluminium, showing the optimum pH of 6.5 (i.e. lowest level of residual aluminium). 

Thus a simple jar test with a matrix of different concentration Alumimum Sulphate and pH (from Lime adjustment) will give you a range of samples to measure the residual aluminium versus pH in treated water sample using e.g. flame Spectrophotometry. 

Regards, 

Erik Thorbjorn Norremark

Low-cost WASH

https://www.linkedin.com/in/erik-thorbjorn-norremark/