1. Do not forget to enter the pool water volume in the field Pool Size

2. Test the water for calcium hardness (CH) and enter it in the field Current CH

3. Enter the CH level that you want to get in the field CH target and press Enter

4. Or move the slide selector below the field to the desired CH value.

5. The CALCULATOR shows how much calcium chloride you have to add to achieve the new higher CH level, or the volume of water you need to replace in order to achieve the new lower CH level

PLEASE NOTE:

Check carefully the form of calcium chloride in the package label. The most common is the anhydrous form and has a molar mass of 111 gr/mol, but we often come across the dehydrated form, with a molar mass of 147 gr/mol. That means you will spend 32% more in weight of the dehydrated form than when using of the anhydrous form to rise the same ppm of CH

If you have entered a value of the target calcium hardness less than the current calcium hardness, that means you like to reduce your pool CH level. Be aware that the calculator only provides the reduction of calcium hardness by draining the vessel (totally or partially) and refilling it with lower-hardness water.

Enter the calcium hardness of the fresh water available water for refilling. The field Replace displays the amount of water you have to drain and refill