pH Acid Water

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pH is a measurement of the hydrogen ions (acid) present in a solution (water). The pH scale is a logarithmic scale (ranging from 0-14) used to determine that hydrogen concentration. At a neutral pH of 7.0, there is an equal amount of hydrogen H+, as there is of hydroxyl radicals (OH-). Any number below 7 is considered acidic (aggressive) and any number above 7 is considered basic or alkaline. A pH of 5, for example, is ten times more acidic than 6 and 100 times more acidic than 7. The opposite is true for numbers above 7, which can represent the lack of hydrogen in the form hydroxyl radicals. The greater the number on the pH scale represents the increased number of hydroxyl radicals present and the more alkaline the water becomes. Low pH can dissolve copper plumbing for example. High pH water can create favorable scaling conditions and can be irritating to bathers and dry out skin and hair. Also, highly alkaline water may taste like a soda and may cause several health problems, too. Due to all these reasons, the neutralization of water is important. In the US, there are a number of state and federal regulatory requirements implemented to curb the discharge of acidic or alkaline effluents into lakes, streams, and sewer systems. Any non-compliance to these laws may result in fines or other severe legal consequences. It can be rightly said that the demand for pH neutralization systems has increased among process engineers or water authorities who want to avoid a notice of violations (N.O.V’s), improve safety of users and other life forms consuming the water, and lower their operational costs. pH neutralization for wastewater treatment or drinking water treatment can be accomplished using various pre-designed pH neutralization systems.

What are pH Neutralizing Filters?

pH neutralizing filters are devices that are raised to increase the pH value of drinking water to around 7. This helps reduce plumbing or corrosion problems in pipes, which deliver drinking water.

How pH Neutralizing Filters Work?

Neutralizing filters have a sacrificial media inside a vessel. Common trade names of these media are Calcite, Flomag and Corosex. Calcite media is essentially limestone (calcium carbonate) and is ideal for water have a pH below 7 and above 6.4. The latter two are magnesium carbonate and are used for water that have a lower pH as they dissolve much faster. As the media dissolves, it will neutralize the excess hydrogen and increase the pH by adding carbonate. It will also increase the hardness which at times is beneficial. These pH neutralizer filters can also be used to “re-mineralize” and improve the taste of water after being treated with reverse osmosis systems.

A basic pH neutralizer system features a vessel (polypropylene tank reinforced with an outer layer of fiberglass) and a filter head. These can either have an inlet/outlet head or a back washable valve head. Inside the vessel, there is a riser tube connected to the head and extends to the bottom of the vessel with a bottom distributor (screen). The media will be a calcium carbonate mineral or a magnesium carbonate mineral.

For slow moving water, it is advisable to use a back washable valve to lift the media and prevent the media from caking. Caking is a term used when the media fuses together and creates channels, reducing water’s contact time, and creates pressure loss. If an in/out head is used, it is recommended to use a reverse flow so the water come through the riser tube to lift the media and reduce the potential for caking. For larger volumes of water being treated in commercial or industrial applications, soda ash is generally used via a chemical feed system.

A Brief Discussion on Other Types of pH Adjustment Devices

Other technologies can be used to lower pH if the alkalinity is having issues on appliances/equipment or makes bathing uncomfortable. The following are a few important pH adjustment systems used today.

  • Acid Injection System: The acid injection via a chemical feed system is one of the most pH neutralization systems in use today. An acid injection is used to treat water with high pH values. The water with pH 9 or above is known to corrode metals such as copper, zinc, aluminum, iron, and brass. An acid injection system comprises a chemical feed pump designed using corrosion-resistant materials. This pump injects a solution of white vinegar or acetic acid into high pH water. This injection helps reduce the soda taste in water, and improves the results of chlorination. Some acid injection systems also use alum and citric acid, however, they can be expensive.
  • Carbon Dioxide Injection Systems: Carbon dioxide (CO2) injection system can be a cost-effective option for treating large volumes of water and have PLC options for remote monitoring. These systems are common in larger commercial and agricultural applications including controlling scale in cooling towers. Smaller, less-sophisticated CO2 systems have found their way into the swimming pool market.
  • Anion Exchange Resins: Anion exchange resins also can remove alkalinity and reduce pH, the same as reverse osmosis. Succinic acid is used for pH neutralization.

Carbon dioxide injection systems and anion exchange resins are generally not used to treat high pH or alkalinity; however, the reduction of alkalinity and pH is a byproduct of the process. You can approach us today to know more about the effectiveness of different pH neutralizers and their importance in your project. We are committed to help you resolve your pH issues or other water quality issues by providing you the best quality products like pH neutralizers at unbeatable prices.


pH Acid Water

Water containing a low pH is acidic and can leach metals such as copper and lead into your plumbing. The sacrificial medias used on our systems will neutralize the acid and raise the pH of the water.