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Product Summary

  • SpaGuard Calcium Hardness Increaser is designed to raise and maintain the calcium hardness levels in spa or hot tub water.
  • Proper calcium hardness levels help prevent corrosion of spa equipment and extend the life of various components, including heaters and pumps.
  • The product is formulated for easy and accurate application, ensuring a hassle-free process when adjusting calcium levels.
SpaGuard Calcium Hardness Increaser 12 oz by SpaGuard
Keep your spa water in balance with SpaGuard Calcium Hardness Increaser 12 oz. This easy-to-use formula helps to raise calcium hardness levels and prevent corrosion and staining on spa surfaces. Simply follow the instructions on the package and enjoy clear, balanced spa water.
Sale Price: $9.99 Show More

Frequently Purchased Together

Total Price for 3 items $57.97

Product Details

SpaGuard Calcium Hardness Increaser 12 oz

SpaGuard's Spa Calcium Hardness Increaser is the perfect solution for spa owners to increase their calcium hardness levels easily and effectively. This granular formula is simple to use and helps boost calcium hardness to a safe level, preventing extensive corrosion of the spa's plumbing, jets, fixtures, and tub surfaces that can occur with low calcium levels. By gradually raising the calcium levels, this product ensures that you don't end up with too much calcium, which can lead to scale build-up and cloudy water. Maintaining optimal calcium hardness levels between 200-400 ppm is crucial for preventing corrosion, as anything below 100 ppm can cause damage to your spa.

Product Features:

  • 1 tbs. per 100 gallons raises the total hardness 25 parts per million
  • Prevents surface etching due to low calcium hardness
  • Helps prevent equipment and spa surface corrosion and damage

Product Specifications

  • Manufacturer: SpaGuard
  • SpaGuard Item Number: 42636BIO
  • Item Number: 42636
  • UPC/GTIN: 00017541612326
  • Condition: New

SpaGuard Item 42636 Documentation and Manuals

  • There are currently no documents or manuals available for this item.
  • SpaGuard 42636 meets or exceeds all industry standards and specifications.
  • If you need additional information on this product please Contact Us.

SpaGuard Item 42636 Suggested Applications

  • All Inground Spas and Hot Tubs
  • All Portable Spas and Hot Tubs

Shipping Rates

Orders Under $50 $5.00
Orders Over $50 FREE
3-Day Premium add $50.00
2-Day Premium add $65.00

Shipping Policies:

  • We only ship orders to the 48 contiguous United States.
  • Chemicals, pool paint, and some oversized items, will only ship via ground service.
  • Items shipped via Freight Service, such as pool heaters, will only ship via ground service.
  • All orders shipping to Maryland will incur a 6% sales tax charge.
  • Some items, including hazmat, may require a Direct Signature upon delivery.
  • Shipments must be inspected by customer prior to signing delivery receipt.
  • Orders containing small and light-weight items may ship via FedEx SmartPost or USPS.

Order Returns

You may return an item sold to you by up to 30 days after purchase. The product must be in good condition, unused, in original packaging, and must have all parts, accessories and paperwork; returns without these requirements and/or guidelines will not be accepted.

If a delivery attempt is unsuccessful on order requiring a direct signature, a 15% - 25% re-stock fee may be applied should the order be returned to by the carrier.

Any claims to missing parts, items or damaged goods for any orders must be made within 15 days of delivery date. We are not able to credit your shipping and handling fees if the wrong product was ordered due to customer error. However, if you received the wrong products due to an error on our behalf, we will pay for the return services fees and you will receive a full refund or exchange.

To return an item to, please call 800-4MY-POOL to get a Return Merchandise Authorization number (RMA) and return instructions. Any items returned without an RMA number will be refused. We will process your refund upon receipt of the returned product.

Products that cannot be returned:

  • Pool Chemicals
  • Special Orders
  • Pool Liners
  • Pool Paint

Products that may incur a re-stock fee of 15% - 25%:

  • Pool Cleaners *
  • Pool Heaters *
  • Pool Pumps *
  • Pool Filters *
  • Pool Lights & Fixtures *
  • Pool Ladders & Rails *
  • Pool Slides *
  • Pool Chlorinators *
  • Custom Manufactured Safety Covers *
  • Pool & Spa Electronics or Controls *
  • In-Stock Safety Covers *
  • Pool Covers that are Ordered and for the Incorrect Pool Size *
  • Baby-Loc Brand and other Safety Fencing *
  • Spa Cover Lifters *
  • Umbrellas & Umbrella Stands, and Hammocks *

* These products must not have been used, installed, or attempted to have been installed. All products must include original paperwork, parts & accessories, and everything accompanied with the product.

Concealed damage on any ground shipment must be reported within 3 business days. Freight shipments must be inspected for damages prior to customer signing delivery receipt. Please email any information regarding concealed damage to Please reference your order number in all order related email correspondence.

Customer is responsible for any/all return shipping charges. Some returns may be subject to a 15% - 25% restock fee that will be deducted from your refund.

Please call 800-4MY-POOL if you have questions regarding this return policy.

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