---
product_id: 452759811
title: "Spa 86131 Alkalinity up, Spa & Hot Tub Chemical Raises Alkalinity, Stabilizes pH Fluctuation, 1.25 lbs"
brand: "hth"
price: "$68.14"
currency: USD
in_stock: true
reviews_count: 5
category: "Hth"
url: https://www.desertcart.us/products/452759811-spa-86131-alkalinity-up-spa-and-hot-tub-chemical-raises
store_origin: US
region: United States of America
---

# Stabilizes pH fluctuations Raises alkalinity 80-120 ppm Protects spa surfaces & equipment Spa 86131 Alkalinity up, Spa & Hot Tub Chemical Raises Alkalinity, Stabilizes pH Fluctuation, 1.25 lbs

**Brand:** hth
**Price:** $68.14
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your spa game—because balanced water means blissful soak sessions!

## Quick Answers

- **What is this?** Spa 86131 Alkalinity up, Spa & Hot Tub Chemical Raises Alkalinity, Stabilizes pH Fluctuation, 1.25 lbs by hth
- **How much does it cost?** $68.14 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/452759811-spa-86131-alkalinity-up-spa-and-hot-tub-chemical-raises)

## Best For

- hth enthusiasts

## Why This Product

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

## Key Features

- • **Spa Longevity Booster:** Safeguards pumps, filters, and heaters from damage, extending your spa’s lifespan.
- • **Easy Maintenance Routine:** Pair with HTH Spa Test Strips for effortless twice-weekly water testing and perfect balance.
- • **Precision Alkalinity Control:** Maintain spa water alkalinity within the ideal 80-120 ppm range for crystal-clear comfort.
- • **Universal Sanitizer Compatibility:** Works seamlessly with bromine, chlorine, and biguanide systems—no compromises.
- • **pH Stability for Ultimate Comfort:** Prevents skin and eye irritation by keeping pH levels balanced and steady.

## Overview

HTH Spa 86131 Alkalinity Up is a 1.25 lb spa chemical designed to raise total alkalinity and stabilize pH levels, ensuring clear, comfortable water while protecting spa surfaces and equipment. Compatible with all major sanitizers, it helps maintain optimal water chemistry between 80-120 ppm alkalinity, prolonging spa life and enhancing user comfort.

## Description

Low alkalinity levels in spa water can cause undue damage to surface and equipment. HTH Spa Alkalinity Up not only raises the total alkalinity in your pool water, but it also helps keep the pH levels from fluctuating. This helps prolong the life of spa surfaces and equipment, like filter systems, and ensures healthy, comfortable water by protecting against skin and eye irritation. HTH Spa Alkalinity Up is compatible with all sanitizers including bromine, chlorine and biguanide. How To Use: Use HTH Spa Test Strips to test your spa water. If the total alkalinity level measures below 80 ppm, apply HTH Spa Alkalinity Up directly to your spa water. Refer to on-pack instructions for the correct dosage. Allow water to circulate for 1-3 hours. Test and repeat as needed to maintain total alkalinity levels between 80 and 120 ppm. About HTH Spa Care: For generations, HTH has been leading the way in smart spa care. We do the chemistry so you can just take it easy. From the very first day you open your spa, HTH is here to help maintain and problem solve. Our complete range of simple-to-use, no-nonsense products empower you to balance, sanitize and treat your spa—it’s everything you need and nothing you don't. There is nothing more relaxing than taking it easy in sparkling, clean water. With HTH, your spa is always ready when you are.

Review: Exactly what we needed for our very hard well water to help balance our hot tub. Product was excepting its performance and I would highly recommend to anyone needing hot tub supplies. We love in a rural community and prompt and professional service is very important to us!
Review: Best price and products works great

## Features

- BENEFIT: Easily raise the total alkalinity levels in your spa water to ensure it remains clear, clean, and healthy
- CREATES MORE COMFORTABLE WATER: Keeps the pH levels in range, which helps protect against skin and eye irritation
- PROLONGS THE LIFE OF YOUR SPA: Helps prevent damage to spa surfaces and equipment (pumps, filters, and heaters)
- COMPATIBLE WITH ALL SANITIZERS: HTH Spa Alkalinity Up works great with bromine, chlorine and biguanide systems
- YOU'RE ALL CLEAR WITH HTH: For best results, use HTH Spa Test Strips twice a week to test, balance and maintain total alkalinity levels between 80 and 120 ppm

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09JZWWJTC |
| Batteries Included? | No |
| Brand | HTH |
| Color | No Color |
| Customer Reviews | 4.7 4.7 out of 5 stars (711) |
| Date First Available | 6 July 2022 |
| Department | Unisex-Adult |
| Included Components | HTH Spa 86131 Alkalinity up, Spa & Hot Tub Chemical Raises Alkalinity, Stabilizes pH Fluctuation, 1.25 lbs |
| Item model number | 86131 |
| Manufacturer | Innovative Water Care |
| Material Type | Plastic |
| Number of Items | 1 |
| Power Source | hand_powered |
| Product Dimensions | 6.43 x 6.43 x 19.96 cm; 589.67 g |
| Size | 1.25lb |

## Images

![Spa 86131 Alkalinity up, Spa & Hot Tub Chemical Raises Alkalinity, Stabilizes pH Fluctuation, 1.25 lbs - Image 1](https://m.media-amazon.com/images/I/61XnRqBb72L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by T***E on 21 October 2025*

Exactly what we needed for our very hard well water to help balance our hot tub. Product was excepting its performance and I would highly recommend to anyone needing hot tub supplies. We love in a rural community and prompt and professional service is very important to us!

### ⭐⭐⭐⭐⭐ Review
*by A***K on 21 November 2025*

Best price and products works great

### ⭐⭐⭐⭐⭐ Review
*by C***E on 13 November 2025*

Good

## Frequently Bought Together

- HTH Spa 86131 Alkalinity up, Spa & Hot Tub Chemical Raises Alkalinity, Stabilizes pH Fluctuation, 1.25 lbs
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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-04*