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Put simply is the measurement of electromotive force in fluids.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

At the beginning, pure water is nuetrel; this means it is neither acidic, nor alkaline, unless other substances are introduced or heat is applied. A PH reaction in a fluid is a direct result of the increase or decrease of compatible ions and this is what you measure when you test PH. When testing it is measured at a range from 0 to 14 on a standard scale, but is actually 1 to 10-7 grams equivalent, converted to 0 to 14 to simplify. In a standard test neutral is achieved at 7.From 0 to 7 is classed as acidic. Then you have 7 to 14, which is alkaline. When testing PH you are also measuring the hydrogen ion and the ion product of water, this is extremely sensitive to temperature. As you look into PH at an ion level, you find what is truly going on, fluctuations and battles between varied bases and acids. Between these two is where the electromotive force is occurring. I suppose it could be compared to a cloud and the lightening between it and the earth, but on a microscopic level. This is the PH environment. The most detrimental affect of these actions is the destabilizing of hydrogen and oxygen ions as h2o, this balance of two parts hydrogen and one part oxygen becomes disrupted and especially when ammonia is present and stability is lost. Water in itself, is to some degree a electromotive neutralizer, but when temperature and pollutants are abundant the PH has to be controlled by us.. One controlling method is to add calcium (ca+2) to the water as a positive to offset the negative acids. Some examples of these are, phosfate, nitrite and nitrate, all these contain negative ions. When applying calcium, it is a short-term fix without buffering agents. In salt water, of which this is mainly based on, the salt is not an acid as it contains hydrogen ions and not metal ions, as acids contain. From acids we look at bases. Rotting matter in the water produces some examples. These are alcohol, either, ketons and nitro compounds. All these can also be classed as sulphuric acids.One interesting thing at the center of all this is hydrogen, this substance is extremely light and rises into the air picking up oxygen, then falls as neutral ph (rain). The best way to obtain good PH and carbonate hardness is to cascade the water over calcium. This means a long or multiple dry sections as part of you’re bio filter with lots of coral rubble or shells. Combine this with plants and aged bioactivity; you then have spot on PH with no need for testing. Optimum conditions are-(salinity. for fish-14 to 26-inverts-22 to 28) (Temperature-fish-18 to 30-inverts-16 to 28) Plenty of calcium kept very clean, with the exception of live rock. Clean filter wool or replace it every three to four days.Youre result is excellent longevity for you’re tank inhabitants.

PH The measure of quantity of the acidity and basicity of Aquarius and other fluids.

The letters PH was originally interpreted as Hydrogen power,but in recent times German scientists changed that to power of hydrogen-PH.