one more point. Baking soda (sodium bicarbonate) will lower your ph but should only for a few minutes to let's say Max an hour.
I use Baking Soda only, to make up for any deficinceys in my alk level and if I have my ph monitor on and I add 1 tbls to my system (total watervolume of about 150g). I can watch my ph drop rapidly to about 7.9 from 8.2. This last for maybe 2 to 3 minutes at most and then the ph is back to it's original 8.2.
cheers
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No matter what the morrow brings, inventors keep inventing things.
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Jonathan
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www.cakerybakery.ca
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