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Pickling adjusts the PH level of the foods being canned to make them safe. Low PH level foods have vinegar added to them in specific amounts to raise the acid level.
The optimum pH for activity of Peroxidase is 5-7 that is about neutral. The Hydrochloric acid reduces the pH and thus inactivates the enzyme with reducing pH.
the limitation of ph in beer manufacture
There are specifically designed pH reducing chemicals for use with concrete that can be purchased online, and most likely from chemical and construction supply stores.
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Kidneys
pH and Alkalinity/Acidity are functions of each other. pH's above 7.0 are considered alkaline and pH's below 7.0 are considered acidic. So reducing the alkalinity will by it's very nature reduce the pH of the pool.
There are a couple of things you can do to control the pH of the water for tropical fish. You can for example drain the water and start over.
pickling
Acid pickling means pickle the acid.
families can control the population by reducing the rate of reproduction within the family.
A buffer.