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www.talkfishy.com/.../650-what-are-the-main-causes-of-low-ph-in-an-aquarium-part-1

Causes for a Drop in pH. You already know that low pH values (values below 7.0) are considered acidic, so it makes sense that the pH level in your tank will drop following the addition of acids. Extra acid can make its way into your tank through several means -- some are naturally occurring and some may be the result of a mistake on your part.

www.answers.com/Q/What_causes_pH_levels_to_drop_in_a_swimming_pool

What causes pH levels to drop in a swimming pool? Answer. Wiki User July 14, 2008 2:15AM. The fill water can be acidic. Hm, by "drop" you mean going from 7.8 to 6.8 or lower? If you use jumbo tabs ...

www.troublefreepool.com/threads/why-does-the-ph-of-my-pool-constantly-drop.44765

pH: 7.4 I'll bring the pH up to 7.6 with washing soda and over about 10 days it drops again to 7.2. Repeat every 10 days. Pool is kept covered when it's cool out and uncovered when it's warm. I notice no difference in the rate of pH change with the cover on or off. Any ideas? •••

www.fishlore.com/aquariumfishforum/threads/why-is-my-ph-dropping-help.94067

This tank is driving me nuts! The pH keeps dropping, no matter what I do. I let the tap water sit 48-72 hours (with the conditioner added) before I do a water change.I test the water right before adding to the tank and the pH is always dead on 7.0.

www.rollitup.org/t/what-causes-ph-to-drop.429449

well I have a reaccuring issue with my crops. what I have going on is once I hit the 5th week of flower my my ph starts to drop and I mean when I start out with a fresh batch of nutes the first 3 or 4 days it rises like normal then all of the sudden it will drop like a point to a point and a half overnight.

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

The pH level in your tank is important and it may change from time to time – when it does, you need to know what you can do to get it back to normal. Causes of Change in pH. The pH of your tank water is a measure of the alkalinity or acidity and it is measured on a scale from 0 to 14. A neutral pH is measured at 7.0.

answers.yahoo.com/question/index?qid=20070323164615AA9zF9o

If you have to adjust the pH in your tank, always consider the carbonate hardness. The pH in harder water more difficult to adjust because it bounces back, while softer water is more easily adjusted. Keep in mind to change it slowly as it causes a lot of stress to your fish. Maintaining a stable pH is generally more the way to go.

www.whoi.edu/oceanus/feature/small-drop-in-ph-means-big-change-in-acidity

Oceanus Magazine. Small Drop in pH Means Big Change in Acidity. Small Drop in pH Means Big Change in Acidity The key danger factor is an increase in dissolved hydrogen ions. ... The scale is not linear—a drop from pH 8.2 to 8.1 indicates a 30 percent increase in acidity, or concentration of hydrogen ions; a drop from 8.1 to 7.9 indicates a ...

www.poolwizard.net/problems/ph.htm

pH balance in swimming pools is possibly the most critical element of pool water maintenance. If you consider that chlorine's ability to do its job is directly linked to the pH, high or low levels inevitably lead to sanitization problems.

www.youtube.com/watch?v=VW6R_DZAwNc

If you notice that your recirculating hydroponics nutrients pH is becoming more acidic (pH going down) and wondered why the pH is drifting then watch this! Using cilantro (coriander) growing in ...