There are chemicals supplied in with pH test kits that will raise and lower the pH of the water. Pet shops also carry spares. I would advise you not to mess with the pH of your water if you do not know EXACTLY what you are doing. It is very easy to wipe out a whole fish tank with pH shock. My advice is to only keep the kind of fish that like the kind of water that you have supplied by your water board.
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To increase the pH level of water, you can add alkaline substances like baking soda, lime, or crushed coral. To lower the pH level, you can add acidic substances like vinegar or citric acid. It's important to test the water pH and make gradual adjustments to avoid drastic changes that could harm aquatic life.
Hydroxide and other (proton accepting) bases make water more alkaline, higher pH ( >7 - 14)
Absorption of carbon dioxide released by industrial a activity, vehicles and heating with fossil fuels decrease the pH of sea water.
ph level of waste water from pharmaceutical industry
The pH deccrease.
Heating pure water the pH decrease.
Boiling water does not change its pH level; water remains neutral (pH of 7) even after boiling. Boiling water only affects the chemical composition of water by removing volatile impurities and gases.
The pH level of bore water can vary depending on factors like mineral content and surrounding environment. Generally, bore water has a pH level between 6.5 to 8.5, which is considered slightly acidic to slightly alkaline. Testing the pH of bore water is recommended to understand its specific characteristics.