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www.answers.com/Q/What_causes_pH_levels_to_increase

pH is the negative logarithm of the hydrogen ion concentration; so an increase in hydrogen ion concentration give a reduction in pH. A reduction in hydrogen ion concentration causes an increase in pH.

www.fondriest.com/environmental-measurements/parameters/water-quality/ph

A minor increase in pH levels can cause a oligotrophic (rich in dissolved oxygen) lake to become eutrophic (lacking dissolved oxygen). Even minor pH changes can have long-term effects. A slight change in the pH of water can increase the solubility of phosphorus and other nutrients – making them more accessible for plant growth ¹⁰.

www.petguide.com/blog/fish/what-causes-ph-changes-and-how-to-fix-them

Causes of Change in pH. ... When you increase the oxygen levels in your tank water you will be decreasing the carbon dioxide levels and that will increase the pH. Adding an airstone to your tank or installing a more powerful filter can have these effects. Using baking soda. If you need to change the pH of your tank water, adding baking soda may ...

www.hunker.com/13416088/how-to-raise-ph-in-a-hot-tub

Water with a low pH level corrodes the hot tub's metal parts, heater and the seals. Low pH also causes skin irritation. Hot tub water with low pH has a high acidic level. Before raising the pH level, test and adjust the water's total alkalinity -- total alkalinity controls and holds the water's pH level.

www.aquariacentral.com/forums/threads/what-causes-ph-increase.119267

uncycled ammonia will increase the PH, yes.. but according to the measurements indicated at the beginning of this thread, there is no ammonia. it has ALL been cycled.. soo it probably isn't the cause. you aught to check the hardness of your water.. extremely soft water will sometimes change ph quickly.

www.wikihow.com/Raise-pH-in-Pool

How to Raise pH in Pool. Low pH levels in a pool can be caused by rainwater and other foreign particles getting into the water. Corrosion of metal accessories, burning of the nose and eyes, and itchy skin are signs of low pH levels in a...

www.reference.com/science/causes-ph-levels-change-water-4b86778eb926a047

This altered pH in the water is later discharged into sewage treatment plants and bodies of water. Other factors which may change the pH levels in bodies of water are associated with organic material present in the water and plant growth. Decomposed material releases carbon dioxide, which in turn lowers the pH levels in the water.

healthfully.com/causes-high-alkalinity-water-5098791.html

Facts About Human Body's PH LevelsIs Tannic Acid in Water Harmful. Effects of Sodium Hydroxide in a Swimming PoolAcids in Carbonated DrinksHome NutritionWhat Causes High Alkalinity in Water. i Photo by Tessa Watson (License: Creative Commons Attribution)Water is the most important liquid for sustained life because of its neutral pH of 7. It replenishes the supply of liquids lost through sweat ...

www.youtube.com/watch?v=NcFPg2fm11c

Does your pool pH keep going up and you don't know why? Here are some good reasons why your pH keeps increasing even when you're doing everything you can to keep it in line. 1.

www.firsttankguide.net/ph-troubleshooting.php

If the pH is changing in your fish tank, or if the pH is different in the fish tank than it is from the tap (or other water source), you will want to try to figure out why this is happening.Once you have figured out why your aquarium's pH is changing, then you will want to correct the cause so that the change is eliminated.