it would be better to clean the sludge out of the pond first. do a pH
to make sure there is enough hardness, then use the aluminum sulfate.
and pH after it is added to make sure the pH is stable. if your water
out of the tap is soft and low pH, dont use alum. Ingrid

On Sun, 6 May 2007 07:27:44 CST, "Henry & Carolyn"
wrote:

Not sure about the pH, haven't tested that yet. There is a lot of sludge in
my mom's pond. It's twice as big as ours, with less fish, and ours is
clear.

wrote in message
e.com...
I dont believe it is temperature dependent. what is your pH? Ingrid

On Sat, 5 May 2007 08:43:20 CST, "Henry & Carolyn"
wrote:

When do you start putting alum in the pond? Do you have to wait for the
water to warm up?
Carolyn