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A Calcite Filter is the most popular way to neutralize pH. The best way to do this is with what is called a Whole House pH Balancing Filter (pictured to the right). The water flows into a pressurized tank that contains calcium carbonate (usually called Calcite) and/or Manganese Oxide (usually called Coresx). At , we normally use Georgia Marble which is an extremely high grade of calcite mined from the "marble region" of Georgia. The calcium carbonate or manganese oxide is absorbed by the water and raises the pH. This method is best for water that has a pH of 5.5 or higher. The tank is equipped with an automatic backwashing valve that periodically (typically every 2-3 days) backflushes the calcite media (the opposite direction of the normal flow) to the drain for a few minutes to re-classify the media and remove any precipitated solids and/or iron. In the process of raising the pH in the presence of iron, some iron will precipitate out and needs to be backflushed to remove it. A calcite filter adds hardness back to the water, so in many cases, a water softener follows the calcite filter in order remove the hardness added in the neutralization process. If you are using a calcite type backwashing filter, you may need to soften the water after it so as to remove the hardness that the calcite adds back to the water, unless your water is naturally soft in the first place. A backwashing type of pH Balancing filter is generally the best because every few days it backwashes for a few minutes to remove any dissolved sediment, iron and the like. It also is very desireable to have a backwashing filter so that the media does not channel and clog up or cake. An Uplow Calcite Filter can be utilizes, especially if the water is very clean, like in whole-house RO applications or in beverage or craft beer applications. We also offer a pH Neutralizing Filter System with a cartridge that can be refilled. This is often called re-mineralization and is also used for whole-house RO and craft beer brewing systems. At US Water Systems, we offer two sizes of backwashing pH Balancing Filters and our tanks have fill ports at the top of the tank so that you do not have to disconnect the control valve when adding media. acidic water low ph
A figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline. The pH is equal to −log10c, where c is the hydrogen ion concentration in moles per liter.