"Hal" wrote in message
...
The best temporary control for pH is baking soda, or bicarbonate of
soda. A more lasting remedy would be calcium carbonate. I use
ground garden limestone which stops dissolving at about a pH of 7.8
and won't raise the pH higher. I think sea shells stop at about the
same pH, but ground garden limestone is available at local garden
centers.
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Or get it for free if you know someone with a little property in a limestone
area. I get it clean and free from the woods behind my house. The PH of my
ponds never dropped below 7.2 in the days I checked it regularly.
--
McKoi.... the frugal ponder...
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