Monday, Feb 09, 2015 at 16:50
Stephen/Notso,
From my experience, using alum and an alkali together does not work.
Better to use the alum first, let it do its thing, then add the alkali to raise the ph. We used to use Hydrated Lime to raise the ph. Don't know how successful this was as never checked the ph.
Another hint to increase the floccing effect is to dissolve the alum etc in hot
water first, then add this to the
water to be cleared........works much quicker than adding the dry ingredient.
As
well as stuff already mentioned in the thread, you can use cement powder, some of the iron salts and I think, even liquid acid. Not so safe, for the last one. :-)
Never ever used Epsom Salts..........always feared what effect it might have on one's system. :-). Drinking alum
water can have some a similar effect too.
Bob
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