---
product_id: 306891188
title: "Spaguard Spa Calcium Increaser Spaguard Spa Calcium Hardness Increaser - 12"
brand: "spaguard"
price: "$40.92"
currency: USD
in_stock: true
reviews_count: 5
category: "Spa Guard"
url: https://www.desertcart.us/products/306891188-spaguard-spa-calcium-increaser-spaguard-spa-calcium-hardness-increaser-12
store_origin: US
region: United States of America
---

# Raises calcium hardness by 25ppm per tbsp Protects spa equipment from corrosion Prevents plaster etching & surface damage Spaguard Spa Calcium Increaser Spaguard Spa Calcium Hardness Increaser - 12

**Brand:** spaguard
**Price:** $40.92
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your spa game—because soft water is so last season!

## Quick Answers

- **What is this?** Spaguard Spa Calcium Increaser Spaguard Spa Calcium Hardness Increaser - 12 by spaguard
- **How much does it cost?** $40.92 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/306891188-spaguard-spa-calcium-increaser-spaguard-spa-calcium-hardness-increaser-12)

## Best For

- spaguard enthusiasts

## Why This Product

- Trusted spaguard brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Equipment Lifesaver:** Prevents costly corrosion and extends spa life
- • **Spa-Ready Confidence:** Maintain perfect water chemistry for a flawless soak
- • **Effortless Maintenance:** Simple dosing keeps your spa balanced and pristine
- • **Precision Calcium Boost:** Just 1 tbsp per 100 gallons for optimal hardness
- • **Ultimate Surface Protection:** Stops plaster etching caused by soft water

## Overview

Spaguard Spa Calcium Increaser is a powerful formula designed to raise calcium hardness by 25ppm per tablespoon per 100 gallons, preventing plaster etching and protecting spa equipment from corrosion caused by low calcium levels. Ideal for maintaining balanced, long-lasting spa water quality.

## Description

Raises calcium hardness levels to prevent corrosion that "soft" water can cause.

Review: This chemical line works great in my hot tub
Review: Very pleased with the product we have received from the dealer.

## Features

- Item Category: Pool Spa Water Treatment
- Item Trademark: GENERIC
- Manufacturer: Generic

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B007ZUD2IU |
| Brand Name | SpaGuard |
| Customer Reviews | 4.7 4.7 out of 5 stars (2,701) |
| Item Form | Powder |
| Item Weight | 12 Ounces |
| Manufacturer Part Number | 42257BIO |
| Model Number | BIO42257 |
| Number of Items | 12 |
| Product Benefits | Prevents Corrosion |
| UPC | 017541612326 017541646123 |
| Unit Count | 12.0 Count |

## Product Details

- **Brand:** SpaGuard
- **Item form:** Powder
- **Item weight:** 12 Ounces
- **Product benefits:** Prevents Corrosion
- **UPC:** 017541612326 017541646123

## Images

![Spaguard Spa Calcium Increaser Spaguard Spa Calcium Hardness Increaser - 12 - Image 1](https://m.media-amazon.com/images/I/613+hwIHJLS.jpg)
![Spaguard Spa Calcium Increaser Spaguard Spa Calcium Hardness Increaser - 12 - Image 2](https://m.media-amazon.com/images/I/91M-1RPhkAL.jpg)

## Available Options

This product comes in different **Item Package Quantity** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by M***P on 12 March 2026*

This chemical line works great in my hot tub

### ⭐⭐⭐⭐⭐ Review
*by M***. on 16 March 2026*

Very pleased with the product we have received from the dealer.

### ⭐⭐⭐⭐⭐ Review
*by A***R on 14 February 2026*

same as i would pay in spa house, but 8 dollars cheaper.

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**Shop now:** [https://www.desertcart.us/products/306891188-spaguard-spa-calcium-increaser-spaguard-spa-calcium-hardness-increaser-12](https://www.desertcart.us/products/306891188-spaguard-spa-calcium-increaser-spaguard-spa-calcium-hardness-increaser-12)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-19*