After reading a lot on here it would seem that using alum as a floc is generally frowned upon .
Its something that a few pool owners i now here in N/E Thailand (as recomended by there pool builder)
do on a regular basis maybe once a month for some of them
i have used it before with good results for clearing my cloudy pool within a day or so .
What i noticed before was it drops the PH when you use it
was wondering what other effects it had on the pool chemistry balance.
Hopefully wont be using it any more as im going to use the method described on TFP
it was more out of interest than anything else and why people seem to be against it .
I now understand if the pool is balanced properly should be no need for it .