---
product_id: 408297883
title: "HTH Spa Alkalinity Up"
brand: "hth"
price: "208 Lei"
currency: RON
in_stock: null
reviews_count: 8
url: https://www.desertcart.ro/products/408297883-hth-spa-alkalinity-up
store_origin: RO
region: Romania
---

# Protects spa equipment & surfaces Raises alkalinity 80-120 ppm Stabilizes pH to prevent irritation HTH Spa Alkalinity Up

**Brand:** hth
**Price:** 208 Lei
**Availability:** ❌ Out of Stock

## Summary

> 💧 Elevate your spa game—because your soak deserves perfection!

## Quick Answers

- **What is this?** HTH Spa Alkalinity Up by hth
- **How much does it cost?** 208 Lei with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/408297883-hth-spa-alkalinity-up)

## 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:** Extend the life of your pumps, filters, and heaters by preventing corrosive damage.
- • **Smart Maintenance Routine:** Pair with HTH Spa Test Strips for twice-weekly checks to keep your spa in peak condition.
- • **pH Stability for Skin & Eyes:** Keep irritation at bay with stabilized pH levels that pamper your skin and eyes.
- • **Balanced Waters, Blissful Soaks:** Maintain perfect alkalinity for crystal-clear, comfortable spa water every time.
- • **Universal Sanitizer Compatibility:** Seamlessly works with bromine, chlorine, and biguanide systems—no compromises.

## Overview

HTH Spa 86131 Alkalinity Up is a 1.25 lb spa chemical designed to raise and maintain total alkalinity between 80-120 ppm, stabilizing pH levels to protect skin and eyes while preventing damage to spa equipment. Compatible with all major sanitizers, it ensures clear, comfortable water and prolongs the life of your spa components.

## 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.

## 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 |
|---------------|-------|
| Item Package Dimensions L x W x H | 8.07 x 2.4 x 2.36 inches |
| Package Weight | 0.69 Kilograms |
| Item Dimensions  LxWxH | 2.53 x 2.53 x 7.86 inches |
| Item Weight | 1.3 Pounds |
| Brand Name | HTH |
| Warranty Description | Warranty |
| Model Name | Spa Care Alkalinity Up |
| Material | Plastic |
| Suggested Users | unisex-adult |
| Number of Items | 1 |
| Manufacturer | Innovative Water Care |
| Part Number | 86131 |
| Model Year | 2022 |
| Included Components | HTH Spa 86131 Alkalinity up, |
| Size | 1.25lb |

## Images

![HTH Spa Alkalinity Up - Image 1](https://m.media-amazon.com/images/I/61XnRqBb72L.jpg)
![HTH Spa Alkalinity Up - Image 2](https://m.media-amazon.com/images/I/71DSLiur+2L.jpg)
![HTH Spa Alkalinity Up - Image 3](https://m.media-amazon.com/images/I/612zbxLgzOL.jpg)
![HTH Spa Alkalinity Up - Image 4](https://m.media-amazon.com/images/I/71G15s1ghrL.jpg)
![HTH Spa Alkalinity Up - Image 5](https://m.media-amazon.com/images/I/81i+0730VKL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ much cheaper than our local spa store!
*by J***J on May 5, 2025*

This hot tub spa alkalinity increaser is a game-changer for maintaining water balance in my hot tub! I had been struggling with fluctuating pH levels and cloudy water, but this product made it so easy to get the alkalinity back to the optimal range. It dissolves quickly in the water and doesn’t leave any residue or cloudiness behind. I noticed a significant improvement in water clarity and feel almost immediately after using it. It also helps stabilize the pH, which means fewer adjustments are needed over time. The instructions are clear and simple to follow, and it’s easy to measure out the right amount for my hot tub’s size. I’ve used this product a few times now, and each time, it does exactly what it’s supposed to – it restores balance to the water and makes my hot tub experience even more relaxing. If you’re looking to keep your spa’s water perfect, I highly recommend this alkalinity increaser!

### ⭐⭐⭐⭐⭐ Works well with cold plunge.
*by G***O on July 1, 2025*

Why did you pick this product vs others?:Need to balance the water for my cold plunge .. this worked well just had to adjust amount.

### ⭐⭐⭐⭐⭐ Love this product
*by S***K on June 22, 2025*

Love this product is amazing for my hot tub!! It’s super easy to pop into the floater with the other chemicals, I would recommend getting one of those, and let it do the work for you! Easy peasy!

## 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 Romania*
*Store origin: RO*
*Last updated: 2026-01-22*