You dont need any kind of ...
Published by Suhasini Bhatnagar, Employee at swaroop enterprises and biotech private limited.
You dont need any kind of Infrastructure if I believe one can just use a pinch of alum and leave it to stand.can be done at Individual homes and in small vessels and the same piece of alum be used in different vessels.Just let the piece be in hand for say 30 secs, whirl it around and leave it undisturbed.Hope this helps.
This is Practised regularly in rural and urban India since generations.