--- product_id: 408297883 title: "HTH Spa Alkalinity Up" brand: "hth" price: "₪69" currency: ILS in_stock: true reviews_count: 13 category: "Hth" url: https://www.desertcart.co.il/products/408297883-hth-spa-alkalinity-up store_origin: IL region: Israel --- # Stabilizes pH fluctuations Balances alkalinity 80-120 ppm Protects spa surfaces & equipment HTH Spa Alkalinity Up **Brand:** hth **Price:** ₪69 **Availability:** ✅ In Stock ## Summary > 🛁 Keep your spa flawless, comfortable, and ready—because your downtime deserves the best! ## Quick Answers - **What is this?** HTH Spa Alkalinity Up by hth - **How much does it cost?** ₪69 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.il](https://www.desertcart.co.il/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:** Safeguards pumps, filters, and heaters from damage, extending your spa’s lifespan effortlessly. - • **Simple, Smart Maintenance:** Pair with HTH Spa Test Strips for easy twice-weekly checks and hassle-free water 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 harsh pH swings that cause skin and eye irritation, ensuring every soak is soothing. ## Overview HTH Spa 86131 Alkalinity Up is a premium spa chemical designed to raise and maintain total alkalinity between 80-120 ppm, stabilizing pH levels to protect spa surfaces and equipment. Compatible with all major sanitizers, it ensures water stays clear, comfortable, and irritation-free, making spa maintenance simple and effective for a consistently luxurious soak. ## 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: 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. Review: Perfect for Alk Up! - ’ve been using this with my Coleman SaluSpa, and it’s done exactly what I needed it to do. My alkalinity was a little off, and this brought it back into range pretty quickly without a lot of guesswork. It dissolves well and doesn’t leave any residue, which is always a plus when you’re dealing with spa chemicals. Once balanced, I noticed the pH stayed more stable instead of bouncing around, so I’m not constantly having to adjust things. The container size is also practical—you don’t need a ton each time, so it should last a while depending on how often you’re maintaining your water. For the price, it’s a great value and an easy addition to regular spa maintenance. If you’re running a SaluSpa or similar setup and need something reliable to keep your water balanced, this does the job well. ## 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 | #7,053 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #38 in Swimming Pool Balancers | | Brand | HTH | | Brand Name | HTH | | Customer Reviews | 4.7 out of 5 stars 791 Reviews | | Included Components | HTH Spa 86131 Alkalinity up, | | Item Form | Powder | | Item Type Name | Spa & Hot Tub Chemical Raises Alkalinity, Stabilizes pH Fluctuation | | Item Weight | 0.01 Ounces | | Manufacturer | Innovative Water Care | | Manufacturer Part Number | 86131 | | Manufacturer Warranty Description | Warranty | | Model Number | 86131 | | Number of Items | 1 | | Product Benefits | Protects Against Skin Irritation | | UPC | 073187861313 | | Unit Count | 20.0 Ounce | ## 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 ### ⭐⭐⭐⭐⭐ 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. ### ⭐⭐⭐⭐⭐ Perfect for Alk Up! *by P***T on April 19, 2026* ’ve been using this with my Coleman SaluSpa, and it’s done exactly what I needed it to do. My alkalinity was a little off, and this brought it back into range pretty quickly without a lot of guesswork. It dissolves well and doesn’t leave any residue, which is always a plus when you’re dealing with spa chemicals. Once balanced, I noticed the pH stayed more stable instead of bouncing around, so I’m not constantly having to adjust things. The container size is also practical—you don’t need a ton each time, so it should last a while depending on how often you’re maintaining your water. For the price, it’s a great value and an easy addition to regular spa maintenance. If you’re running a SaluSpa or similar setup and need something reliable to keep your water balanced, this does the job well. ### ⭐⭐⭐⭐⭐ Great for hot tub *by D***B on May 5, 2026* Good price and works well ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.il/products/408297883-hth-spa-alkalinity-up](https://www.desertcart.co.il/products/408297883-hth-spa-alkalinity-up) --- *Product available on Desertcart Israel* *Store origin: IL* *Last updated: 2026-06-21*