dont know, but when those "pills" are tossed into soft acid ponds the
pH swings are enough to start killing the fish. It sounds good in
theory, just doesnt work. Another Koivorkian moment.
Ingrid

On Sat, 12 May 2007 09:10:26 CST, Hal wrote:

On Fri, 11 May 2007 08:57:34 CST, wrote:

resist any temptation to use the "pH pill" or plaster of paris, this
makes the pH swing wildly for some reason.

I never heard that before and don't understand it. Calcium carbonate
is the calcium that buffers pH. Calcium carbonate stops dissolving
into the water, when the water reaches a pH of 7.8, although calcium
may continue to add to the general hardness of the water GH does
little or nothing toward buffering pH. Calcium carbonate, in the
form of calcium sulfate, increases the KH when introduced into the
water at a pH of 7.8 . So how does increased levels of calcium
carbonate cause wild pH swings?

Regards,

Hal