--- product_id: 408297883 title: "HTH Spa 86131R, Alkalinity up, 1.25 lbs | Spa & Hot Tub Chemical Raises Alkalinity - Stabilizes pH Fluctuation" brand: "hth" price: "€ 32.22" currency: EUR in_stock: true category: "Hth" url: https://www.desertcart.hr/products/408297883-hth-spa-86131r-alkalinity-up-1-25-lbs-spa-hot store_origin: HR region: Croatia --- # Compatible with all sanitizers Maintains alkalinity 80-120 ppm Protects spa surfaces & equipment HTH Spa 86131R, Alkalinity up, 1.25 lbs | Spa & Hot Tub Chemical Raises Alkalinity - Stabilizes pH Fluctuation **Brand:** hth **Price:** € 32.22 **Availability:** ✅ In Stock ## Summary > ♨️ Elevate your spa game—because your relaxation deserves precision chemistry! ## Quick Answers - **What is this?** HTH Spa 86131R, Alkalinity up, 1.25 lbs | Spa & Hot Tub Chemical Raises Alkalinity - Stabilizes pH Fluctuation by hth - **How much does it cost?** € 32.22 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/408297883-hth-spa-86131r-alkalinity-up-1-25-lbs-spa-hot) ## 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 Surface Savior:** Prevents costly damage to pumps, filters, and heaters—extend your spa’s lifespan effortlessly. - • **Test, Treat, Triumph:** Pair with HTH Spa Test Strips for easy twice-weekly monitoring and hassle-free maintenance. - • **Universal Compatibility:** Works seamlessly with bromine, chlorine, and biguanide systems—no sanitizer left behind. - • **Skin & Eye Friendly Formula:** Maintains pH balance to reduce irritation, so your spa time is pure relaxation. - • **Balanced Alkalinity, Balanced Life:** Keeps your spa water perfectly stable between 80-120 ppm for crystal-clear comfort. ## Overview HTH Spa 86131R Alkalinity Up is a 1.25 lb powder designed to raise and stabilize total alkalinity levels in spa water, maintaining an optimal range of 80-120 ppm. This balance protects spa surfaces and equipment from damage, reduces skin and eye irritation by stabilizing pH, and is compatible with all major sanitizer types including bromine, chlorine, and biguanide. Trusted by thousands, it ensures your spa stays clean, comfortable, and ready whenever you are. ## 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 | |---------------|-------| | ASIN | B09JZWWJTC | | Best Sellers Rank | #4,848 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #34 in Swimming Pool Balancers | | Brand Name | HTH | | Customer Reviews | 4.8 4.8 out of 5 stars (843) | | Included Components | HTH Spa 86131 Alkalinity up, | | Item Form | Powder | | Item Type Name | Spa & Hot Tub Chemical Raises Alkalinity, Stabilizes pH Fluctuation | | Item Weight | 0.27 g | | 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 Ounce | ## Product Details - **Brand:** HTH - **Item Form:** Powder - **Item Weight:** 0.27 g - **Product Benefits:** Protects Against Skin Irritation - **UPC:** 073187861313 ## Images ![HTH Spa 86131R, Alkalinity up, 1.25 lbs | Spa & Hot Tub Chemical Raises Alkalinity - Stabilizes pH Fluctuation - Image 1](https://m.media-amazon.com/images/I/61XnRqBb72L.jpg) ## Available Options This product comes in different **Size** options. ## 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.hr/products/408297883-hth-spa-86131r-alkalinity-up-1-25-lbs-spa-hot](https://www.desertcart.hr/products/408297883-hth-spa-86131r-alkalinity-up-1-25-lbs-spa-hot) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-08-30*