yes, if he doesnt have much alkalinity (calcium) he needs to add some organic
dolomitic limestone to buffer the water. I have lake water with some calcium, but
not enough so I add dolomitic limestone to make sure I got good buffering.
good loam and pea gravel will not affect pH. ammonia can drive the pH up tho.
Ingrid

Charles wrote:
What time of day are you measuring pH?

Diana Walstad reports of a sof****er lake that changed from 5.7 in the
morning to 9.6 at noon. I
this is due to the plants drawing out the CO2 from the water.



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