On Mon, 30 Jun 2003 05:53:05 -0700, in a place far, far away, JSin
made the phosphor on my monitor glow in
such a way as to indicate that:

Look to the lime in your mortor if you are running at 8.o and rebounding
that hard it is being buffered by the the mortar. What is your Tap water
pH???

It's the same, as best as I can tell from a color test (don't have a
meter--a tad over 8, maybe as high as 8.2.

I would bet it is 1 or 2 points lower and I will guarentee your
supplier is running a lot lower especially in thier feeder tanks where
you have a huge bioload and a lot of organic material.

Well, the new pond and the tap are the same, as far as I can tell. My
healthy patio pond (that is replenished regularly from the tap) is
7.6.

But as you say, the fact that it rebounds so quickly from the acid
does indicate a lot of continuing buffering. I'll have to go out and
get a KH test kit, I guess, to really know what's going on.

I've never tried running vinegar over the mortar. Would that help?

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