---
product_id: 408297883
title: "Spa 86131 Alkalinity up, Spa & Hot Tub Chemical Raises Alkalinity, Stabilizes pH Fluctuation, 1.25 lbs"
brand: "hth"
price: "628461₫"
currency: VND
in_stock: true
reviews_count: 13
category: "Hth"
url: https://www.desertcart.vn/products/408297883-spa-86131-alkalinity-up-spa-and-hot-tub-chemical-raises
store_origin: VN
region: Vietnam
---

# 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:** 628461₫
**Availability:** ✅ In Stock

## Summary

> 🛁 Elevate your soak game—because your spa deserves the best balance!

## 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?** 628461₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/408297883-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:** Safeguard your investment by protecting pumps, filters, and heaters from corrosive damage.
- • **Precision Alkalinity Control:** Maintain spa water alkalinity within the ideal 80-120 ppm range for crystal-clear comfort.
- • **Effortless Maintenance Routine:** Pair with HTH Spa Test Strips for quick, twice-weekly water checks and hassle-free spa care.
- • **Universal Sanitizer Compatibility:** Seamlessly works with bromine, chlorine, and biguanide systems—no compromises.
- • **pH Stability for Ultimate Comfort:** Keep pH levels balanced to prevent skin and eye irritation during every soak.

## Overview

HTH Spa 86131 Alkalinity Up is a 1.25 lb spa chemical designed to precisely raise and maintain total alkalinity between 80-120 ppm, stabilizing pH levels to ensure clear, comfortable water. Compatible with all major sanitizers, it protects spa surfaces and equipment from damage, prolonging their lifespan. Trusted by thousands with a 4.7-star rating, it’s the essential, easy-to-use solution for professional-grade spa water balance.

## 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: Exceptional Service - 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: Keeping the alkalinity up, balancing out the other chemicals, and making my kid and dog happy - HTH is my go to brand for all my hot tub (inflatable hot tub supplies)! The products are doing what they're supposed to do to keep the hot tub clean and safe for my son which is all that matters. After using HTH Alkalinity Up in our inflatable hot tub, I can confidently say it’s a fantastic product for anyone looking to maintain optimal water quality with minimal hassle! It's not often we need it but it's a great product when needed. And a fantastic price HTH Alkalinity Up has become an essential part of our tub maintenance routine. It gives peace of mind knowing the water is always comfortable, clean, and ready—whether we’re enjoying a heated soak or cooling off after a hot day. For anyone with an inflatable hot tub looking for an efficient way to keep alkalinity in check, I highly recommend it.

## 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 |
| Best Sellers Rank | #38,269 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #86 in Swimming Pool Balancers |
| Brand Name | HTH |
| Customer Reviews | 4.7 4.7 out of 5 stars (734) |
| Date First Available | October 21, 2021 |
| Included Components | HTH Spa 86131 Alkalinity up, |
| Item Dimensions LxWxH | 2.53 x 2.53 x 7.86 inches |
| Item Package Dimensions L x W x H | 8.07 x 2.52 x 2.48 inches |
| Item Weight | 1.3 Pounds |
| Manufacturer | Innovative Water Care |
| Material | Plastic |
| Model Name | Spa Care Alkalinity Up |
| Model Year | 2022 |
| Number of Items | 1 |
| Package Weight | 0.62 Kilograms |
| Part Number | 86131 |
| Size | 1.25lb |
| Suggested Users | unisex-adult |
| Warranty Description | Warranty |

## 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

### ⭐⭐⭐⭐⭐ Exceptional Service
*by T***E on October 21, 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!

### ⭐⭐⭐⭐⭐ Keeping the alkalinity up, balancing out the other chemicals, and making my kid and dog happy
*by C***C on July 20, 2025*

HTH is my go to brand for all my hot tub (inflatable hot tub supplies)! The products are doing what they're supposed to do to keep the hot tub clean and safe for my son which is all that matters. After using HTH Alkalinity Up in our inflatable hot tub, I can confidently say it’s a fantastic product for anyone looking to maintain optimal water quality with minimal hassle! It's not often we need it but it's a great product when needed. And a fantastic price HTH Alkalinity Up has become an essential part of our tub maintenance routine. It gives peace of mind knowing the water is always comfortable, clean, and ready—whether we’re enjoying a heated soak or cooling off after a hot day. For anyone with an inflatable hot tub looking for an efficient way to keep alkalinity in check, I highly recommend it.

### ⭐⭐⭐⭐⭐ Spa Alkalinity Tests
*by S***A on December 7, 2025*

Works well, we use these to test our hot tub PH levels. They work just as described, and they last us about a month.

## Frequently Bought Together

- HTH Spa 86131 Alkalinity up, Spa & Hot Tub Chemical Raises Alkalinity, Stabilizes pH Fluctuation, 1.25 lbs
- HTH Spa 86133 pH Up, Spa & Hot Tub Chemical Raises pH, Prevents Corrosion, 2 lbs
- HTH Spa 86132 pH Down, Spa & Hot Tub Chemical Lowers pH, Prevents Scale, 2.5 lbs

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-04-25*