Pakistan's natural resources range from natural gas reserves, vast land, coal, petroleum, copper, salt and iron ore among others. It has the second largest salt mines in the world, as well as worldâs fifth largest gold mines.
Leslie's 14427 Hardness Plus, 25 lbs. Leslie's 14428 Hardness Plus, 45 lbs. Keep your calcium hardness at proper levels at all times to help protect your pool, water, and pool equipment. The calcium hardness level in a pool does not increase rapidly, but it is good practice to check the calcium hardness every month. Adding 1-1/4 pounds of hardness plus to 10,000 gallons of water will raise the calcium hardness by 10 ppm. **The minimum level of Calcium Hardness is 150 ppm.
Calcium hardness is a term that measures that amount of dissolved minerals in your swimming pool water. These minerals not only include calcium but magnesium and sodium as well. In the event the calcium hardness is too high, there's a simple way to lower it by partially draining your swimming pool by using your filter. Pool supply stores have chemicals that help soften the water but can be costly and at times ineffective.