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.
Step 1. Drain the water in the pool by at least 6 to 10 inches so that you can easily access the calcium-stained areas. This also allows you to wipe the loosened calcium off without depositing it into the pool water. Step 2. Kneel down on the edge of the pool, or get into the pool if you don't mind getting wet. Place a stiff-bristled tile brush on top of the calcium deposits and scrub the pool tiles using circular motions to loosen the deposits. Step 3. Wipe the pool tile with a cloth or a paper towel to remove the loosened calcium.