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.
Unless your pool is made of concrete, chlorine should never be added directly to the water. If it comes in direct contact with the walls or bottom it may damage materials such as fiberglass or plastic. A general rule you can follow when adding chlorine is 1/2 ounce for every 500 gallons of water on a weekly basis. If you have a 1,000 gallon pool an ounce a week should be enough to effectively sanitize the water. Because there are many factors that affect the amount of free available chlorine in the water, you need to test the pool on a regular basis.