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.
1 Yes, depending on the amount of calcium in your water you may find that scaling will appear on your pool surface if you have a plaster pool. 2  A salt system attracts calcium to the titanium plates and then can discharge it back into the water. 3  This excess calcium can result in a buildup on the pool surface.sually that means you put salt in the water: maybe 400 to 500 pounds for an average size pool in ground pool and you will then use a salt chlorinator in the water piping to z â¦ ap a molecule off the salt to turn it into chlorine.