SpaGuard Calcium Hardness Increaser - 12 oz

Item #: 42636BIO

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Same Day Delivery

Place your order before 2:00 PM and we'll drop it off on your doorstep today! Orders placed after 2:00 PM will be delivered the next day. Every delivery includes a free digital water analysis.

Same Day Pickup

Place your order before 2:00 PM and we'll have it ready for pick-up today. Orders placed after 2:00 PM will be ready the next day.


Sunplay - Ogden
216 N 700 W
Building 4C - Bay 5
Ogden, UT 84404
Store hours:
9am - 5pm, M-F

Las Vegas

Sunplay - Las Vegas
2950 E Sunset Rd
Las Vegas, NV 89120
Store hours:
10am - 6pm, M-F
10am -4pm, Weekends

Item Details

SpaGuard Calcium Hardness Increaser

Calcium Hardness Increaser raises calcium hardness in hot tub water. The desired calcium hardness level in hot tub water should be 100 to 200 ppm. Low calcium hardness, below 100 ppm could cause spa water to be corrosive which may damage spa surfaces and/or equipment.

  • Raises calcium hardness
  • Prevents corrosion of spa components
  • Granular Formula
  • 12 Ounces

Dosage Amounts:

  • Example; Add 4 Tbsp of this product in a 400 gallon spa to raise the calcium hardness by 25 ppm.
  • Read entire label before using. Complete dosage chart can be found on the bottle.

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