---
product_id: 376871288
title: "MAV AquaDoc Calcium Hardness Increaser Hot Tub Owners Rely On, Calcium Booster for Hot Tubs & Spas"
brand: "mav aquadoc"
price: "€ 54.82"
currency: EUR
in_stock: true
reviews_count: 5
category: "Mav Aqua Doc"
url: https://www.desertcart.nl/products/376871288-mav-aquadoc-calcium-hardness-increaser-hot-tub-owners-rely-on
store_origin: NL
region: Netherlands
---

# Raises calcium hardness by 10ppm increments Easy 4-step application process Prevents corrosion, etching & staining MAV AquaDoc Calcium Hardness Increaser Hot Tub Owners Rely On, Calcium Booster for Hot Tubs & Spas

**Brand:** mav aquadoc
**Price:** € 54.82
**Availability:** ✅ In Stock

## Summary

> 💦 Keep your spa flawless and your social circle envious with AquaDoc Calcium Booster!

## Quick Answers

- **What is this?** MAV AquaDoc Calcium Hardness Increaser Hot Tub Owners Rely On, Calcium Booster for Hot Tubs & Spas by mav aquadoc
- **How much does it cost?** € 54.82 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/376871288-mav-aquadoc-calcium-hardness-increaser-hot-tub-owners-rely-on)

## Best For

- mav aquadoc enthusiasts

## Why This Product

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

## Key Features

- • **Made in the USA Quality:** Premium, locally made formula ensures safety and effectiveness every time
- • **Precision Calcium Boost:** Easily increase hardness by 10ppm per ounce for perfectly balanced spa water
- • **Trusted by Hot Tub Owners:** Join 600+ happy users who rate it 4.7 stars for reliable results
- • **Ultimate Water Protection:** Defend your hot tub from costly corrosion and surface damage with professional-grade formula
- • **Effortless Spa Maintenance:** Simple 4-step routine keeps your water crystal clear and inviting

## Overview

MAV AquaDoc Calcium Hardness Increaser is a professional-grade spa chemical designed to raise calcium levels in hot tubs by 10ppm increments, preventing corrosion, etching, and staining. Easy to use with a clear 4-step process, it ensures balanced, crystal-clear water. Highly rated by over 600 users, this USA-made formula is essential for maintaining optimal water hardness and prolonging your spa’s lifespan.

## Description

MAV AquaDoc Professional Calcium Increaser

Review: Worked exactly as intended. My spa water was out of balance and causing cloudy water — one treatment and it cleared right up. Easy instructions, no weird residue.
Review: Produit vraiment bon

## Features

- Make balancing your water easier & more cost effective with AquaDoc's calcium hardness increaser. Our spa calcium hardness increaser is vital to ensuring proper water hardness levels in your hot tub. AquaDoc's Calcium Booster gets your hardness up.
- Avoid corrosion, etching, and staining - AquaDoc's Professional Grade Hot Tub Calcium increaser is your best defense against soft water in your hot tub or spa. Guard calcium levels from decreasing too low with our spa Calcium booster for hot tubs.
- How it works - AquaDoc's Hot Tub Calcium hardness Increaser works to raise your water's hardness level to ensure properly balanced hot tub water. Our spa hardness increaser easily works to raise your Calcium levels by 10ppm increments or more.
- The Hardness Increaser Hot Tub Owners Love - When it comes to Spa Chemicals calcium hardness increaser is a must have. Without hot tub chemicals calcium hardness can become unbalanced. Always have a hot tub calcium booster ready and waiting.
- Easy to Use, Made in the USA - (1) Check your calcium levels, (2) 1 ounce of AquaDoc's Calcium increaser will boost water's hardness level by 10ppm. (3) After determining hardness level goal, add proper amount of increaser while equipment is on. (4) Run filter for 1 - 2 hours, wait 20 minutes, then retest water.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08TGTHK9Q |
| Customer Reviews | 4.7 4.7 out of 5 stars (606) |
| Date First Available | 1 April 2021 |
| Package Dimensions | 20.6 x 5.79 x 5.79 cm; 396.89 g |

## Product Details

- **Brand:** MAV AquaDoc
- **Item form:** Granular
- **Item weight:** 14 Ounces
- **Product benefits:** Corrosion
- **UPC:** 850026022131

## Images

![MAV AquaDoc Calcium Hardness Increaser Hot Tub Owners Rely On, Calcium Booster for Hot Tubs & Spas - Image 1](https://m.media-amazon.com/images/I/71JSnaWpnUL.jpg)
![MAV AquaDoc Calcium Hardness Increaser Hot Tub Owners Rely On, Calcium Booster for Hot Tubs & Spas - Image 2](https://m.media-amazon.com/images/I/71GS0p4cbQL.jpg)
![MAV AquaDoc Calcium Hardness Increaser Hot Tub Owners Rely On, Calcium Booster for Hot Tubs & Spas - Image 3](https://m.media-amazon.com/images/I/71HqhM6r18L.jpg)
![MAV AquaDoc Calcium Hardness Increaser Hot Tub Owners Rely On, Calcium Booster for Hot Tubs & Spas - Image 4](https://m.media-amazon.com/images/I/81FcET-36JL.jpg)
![MAV AquaDoc Calcium Hardness Increaser Hot Tub Owners Rely On, Calcium Booster for Hot Tubs & Spas - Image 5](https://m.media-amazon.com/images/I/71zdKwpUAdL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by E***D on 4 December 2025*

Worked exactly as intended. My spa water was out of balance and causing cloudy water — one treatment and it cleared right up. Easy instructions, no weird residue.

### ⭐⭐⭐⭐⭐ Review
*by N***E on 26 June 2024*

Produit vraiment bon

### ⭐⭐⭐⭐ Review
*by S***E on 25 January 2023*

Unfortunately one cap was not screwed on type and it mostly ended up in the broken bag and lost some , there were 2 bottles and the product worked well .

## Frequently Bought Together

- MAV AquaDoc Calcium Hardness Increaser Hot Tub Owners Rely On, Calcium Booster for Hot Tubs & Spas
- AquaDoc Total Alkalinity Increaser for Hot Tub - Alkalinity Booster for Spas & Fresh Water pH Balance
- Non-Chlorine Spa Shock for Hot tub - Chlorine Free Tub Treatment & Enhanced to Assist Bromine Suitable Oxidizer Oxidizing by AquaDoc

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-02-26*