Directions:  One ounce raises the calcium hardness 7 ppm in 500 gallons of water.
  1. Determine amount of product to be added. The ideal hardness level is 150-400 ppm.
  2. Turn jets ON to circulate spa water.
  3. Pour required amount into the water.
  4. Run filter for 1 to 2 hours.
  5. Retest water to ensure proper level.
  6. Repeat steps 1-5 until proper level is obtained.

Tip: Use Leisure Time Spa & Hot Tub Test Strips to determine hardness level.
Water low in calcium will etch plaster and corrode equipment.
 

Directions For Use: 
  1. Measure water for hardness ( calcium level ) using a suitable test kit.
  2. From the chart below, determine the quantity of Calcium Hardness Increaser required based on results of measured values in step 1. above and capacity of spa.  As a general rule, one (1) ounce of Calcium Hardness Increaser per 500 gallons of spa water will raise the hardness ( calcium ) level by 10 ppm. For plaster spas, ideal hardness levels should be maintained between 225-300 ppm. For vinyl, fiberglass and non-masonry spas, ideal hardness levels should be maintained between 175-225 ppm.
  4. Add Calcium Hardness Increaser directly to the spa water by scattering over a large area. Make certain that the circulation equipment ( filter pump ) is operating.

Warning: DO NOT PRE-DISSOLVE IN A BUCKET OR ADD TO A SMALL QUANTITY OF WATER.
Heat is generated when this product is dissolved in water.

  Note: If pH Increaser ( soda ash ) or Alkalinity Increaser ( sodium bicarbonate ) has recently been added to spa water ( within 24 hours ), it is best not to add Calcium Hardness Increaser until the next day. An insoluble precipitate is likely to form resulting in cloudy water.

 

General Information:
Low calcium hardness in a spa can result in staining, etching or distortion of the spa's surface. Plaster damaged by low calcium hardness can become abrasive and uncomfortable to spa users. Rough plaster can also increase algae problems, thus causing greater difficulty in keeping the plaster surface clean. This can be prevented by using Calcium Hardness Increaser. The calcium hardness level should be maintained in the range of 225-300 ppm for plastered spas. For vinyl, fiberglass and non-masonry spas, ideal hardness levels should be maintained between 175-225 ppm. DO NOT allow the calcium hardness level to fall below 200 ppm for plaster spas.

Notes:
Calcium hardness in spa water should be maintained between 150-250 ppm. Low calcium hardness levels could cause the spa water to be corrosive which may result in damage to the spa surface surface or equipment.

Directions: DO NOT pre-dissolve this treatment as heat is generated when it contacts water.
  1. Test water for calcium hardness level.
  2. Compare test results to chart below to determine appropriate amount of increaser to make adjustments.
  3. With spa circulating pump on high speed add required amount directly into the spa water.
  4. Continue circulating water a minimum of 20 minutes.
  5. Retest and adjust if necessary.