Hardness Plus, 45 lbs.
Leslie's 14420 Hardness Plus for Calcium Hardness, 4 lbs.
Sku: 14420        LPM #: 14420
$11.99
Leslie's 14423 Hardness Plus, 8 lbs.
Sku: 14423        LPM #: 14423
$21.99
$21.99
Leslie's 14425 Hardness Plus, 15 lbs.
Sku: 14425        LPM #: 14425
$34.99
$34.99
Leslie's 14427 Hardness Plus, 25 lbs.
Sku: 14427        LPM #: 14427
$45.99
$45.99
Leslie's 14428 Hardness Plus, 45 lbs.
Sku: 14428        LPM #: 14428
$65.99
$65.99
About the Leslie's Hardness Plus
LPM Part #:
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. Dosage: 1.25 lbs per 10,000 gallons
Pool Chemical Features
  • Calcium hardness increaser
  • Keeps your pool and equipment free from damage
  • Increases calcium hardness by 10 ppm per 1-1/4 lbs.
Leslie's Hardness Plus Specifications
Chemical Type Calcium Hardness
Product Type Pool Chemical
Dosage 1.25 lbs per 10,000 gallons
Product Reviews
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