pH Correction Water Filters are commonly used for various different applications within industrial settings but can also be found in residential settings. pH correction is most commonly required when the water supply comes from a borehole or natural spring. Borehole water usually has a pH lower than the desired pH of 7 and can be as low as 6 pH. If left uncorrected, this can cause a multitude of problems with pipework, tanks, boilers and other water treatment equipment not to mention the effect it can have on your industrial production. Even a 0.1 increase or decrease in pH can greatly effect the quality of your water and depending on your application, could cost you dearly.