One grain per gallon (gpg) is equivalent to 17.14 parts per million (ppm). Water hardness can be measured in gpg or ppm, but gpg is the most commonly used measurement. 20,000–80,000: This range signifies the grain capacity of most water softeners available on the market.

GPG为水硬度单位， 1GPG表示1 加仑水中硬度离子（ 钙镁离子）含量为1 格令。 按美国WQA（水质量协会）标准，水的硬度分为6级：0~0.5GPG为 软水，0.5~3.5GPG为微硬，3.5~7.0GPG为中硬，7~10.5GPG为硬水，10.5~14.0GPG为很硬，14.0GPG以上为极硬。 硬水并不对健康造成直接危害，但是会给生活带来很多麻烦，比如用水器具上结 水垢 、 肥皂 和 清洁剂 的洗涤效率减低等。 当水在大气中凝聚时，它与空气中的二氧化碳反应，形成了叫做 碳酸 的 …

The grain per gallon (gpg) is a unit of water hardness defined as 1 grain (64.8 milligrams) of calcium carbonate dissolved in 1 US gallon of water (3.785412 L). It translates into 1 part in about 58,000 parts of water or 17.1 parts per million (ppm).

According to the Water Quality Association, the hardness scale, measured in gpg of calcium carbonate, can be represented as follows: Less than 1 gpg is considered soft; Between 1 and 3.5 gpg is considered slightly hard; Between 3.5 and 7 gpg is considered moderately hard; Between 7 and 10.5 gpg is considered hard; More than 10.5 gpg is ...

Water hardness chart for sizing water softener systems. This page is designed to explain to the customer what is considered to be hard water. It is very important that you determine your hardness before buying your water treatment equipment. Water softeners are much more efficient when you get the correct size. What is considered hard water?

2024年2月28日 · These levels are measured in grains per gallon (gpg) when it comes to water softeners (more on that below), but water hardness is generally measured in parts per million (ppm) or milligrams per liter (mg/L), which are interchangeable. Here’s a scale depicting the general range of water from soft to very hard in ppm or mg/L: Soft: 0–17 ppm

The standard U.S. water hardness measurement is “grains per gallon” (GPG). In this context, “grains” refers to a specific unit of weight, equivalent to 1/7000th of a pound. Therefore, when we say “grains per gallon,” we are referring to the number of grains of hardness minerals contained in one gallon of water.

When figuring out water hardness, we will sometimes need to convert GPG to PPM. Both of these units determine how hard your water is. To help you out with the conversion, we have created the GPG to PPM calculator, complete with the GPG to PPM chart (with 0.1 …

2024年7月5日 · Water with a measurement of 5 to 10 GPG, or 180 PPM or mg/L of hardness is classed as moderately hard to very hard. These levels of hardness are likely to cause damage in your home, and would benefit from water softening treatment .

Soft water is 0-3 gpg (grains per gallon). Medium water is 3-7 gpg. Hard water is 7-12 gpg. Anything over 12 gpg is very hard, and a water softener is recommended. If you have the hardness in "parts per million" (PPM) or "milligrams per liter" (MgPL) and need to convert to "grains per gallon" (GPG): PPM / MgPL to GPG: Divide by 17.118.