--- product_id: 12525177 title: "API PROPER pH 6.5 Freshwater Aquarium Water pH Stabilizer 8.5-Ounce Container" brand: "api" price: "2931 kr" currency: ISK in_stock: true category: "Api" url: https://www.desertcart.is/products/12525177-api-proper-ph-6-5-freshwater-aquarium-water-ph-stabilizer store_origin: IS region: Iceland --- # 8.5 oz concentrated liquid formula Detoxifies chlorine & heavy metals pH stabilized precisely at 6.5 API PROPER pH 6.5 Freshwater Aquarium Water pH Stabilizer 8.5-Ounce Container **Brand:** api **Price:** 2931 kr **Availability:** ✅ In Stock ## Summary > 🐠 Keep your aquatic ecosystem flawless with perfect pH balance! ## Quick Answers - **What is this?** API PROPER pH 6.5 Freshwater Aquarium Water pH Stabilizer 8.5-Ounce Container by api - **How much does it cost?** 2931 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/12525177-api-proper-ph-6-5-freshwater-aquarium-water-ph-stabilizer) ## Best For - api enthusiasts ## Why This Product - Trusted api brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Versatile Use:** Perfect for new setups, water changes, and pH adjustments - • **Trusted Legacy:** Backed by 50+ years of API’s aquarium care expertise - • **Toxin Neutralizer:** Eliminates harmful chlorine, chloramines, and heavy metals instantly - • **Precision pH Control:** Maintains optimal 6.5 pH for vibrant freshwater fish health - • **Plant-Free Freshwater Focus:** Formulated exclusively for freshwater tanks without live plants ## Overview API PROPER pH 6.5 Freshwater Aquarium Water pH Stabilizer is an 8.5-ounce liquid treatment designed to set and maintain a stable pH of 6.5 in freshwater aquariums without live plants. It detoxifies tap water by removing chlorine, chloramines, and heavy metals, creating a safe and vibrant environment for species like Tetras and Discus. Ideal for new tanks, water changes, or pH adjustments, this product leverages over 50 years of API’s trusted aquarium care science. ## Description pH is the measure of acidity of water, on a scale ranging from 0 to 14. A pH of 0 is the most acidic, while a pH of 14 is the most alkaline. Water with a pH of 7.0 is considered "neutral". Different geographies have different tap water conditions with different pH levels, while fish require a specific pH level to thrive. API PROPER pH 6.5 Freshwater Aquarium pH Stabilizer automatically sets and stabilizes the pH level in freshwater aquariums to 6.5 which is perfect for Tetras, Discus, Rasboras and Angelfish. API PROPER pH 6.5 Freshwater Aquarium pH Stabilizer also removes toxic compounds from tap water such as chlorine, neutralizes chloramines, detoxifies heavy metals, and adds electrolytes, making tap water safe for fish. Use this aquarium treatment when setting up a new aquarium, adjusting pH, or changing water. pH in an aquarium can fluctuate due to fish waste, uneaten food and addition of tap water. It is recommended to test water for pH weekly. With API Aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For over 50 years, API has been creating innovative, research-driven solutions that make it easier to care for your fish and aquarium. API Aquarium Treatment Supplies are designed to work in conjunction with each other to provide best results to control algae, promote healthy bacterial growth and help control and cure fish diseases and conditions such as ich and fin rot. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. With API, you can spend more time admiring your fish, and less time scrubbing your tank. Make sure to use all products as directed in order to ensure the best results. ## Features - Contains one (1) API PROPER pH 6.5 Freshwater Aquarium Water pH Stabilizer 8.5-Ounce Container - Sets and stabilizes water pH to 6.5 to help keep fish healthy and colorful - Removes toxic compounds from tap water to make it safe for fish - Use exclusively in freshwater aquariums that do not contain live plants - Use when setting up a new aquarium, adjusting pH in an established aquarium or changing water ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0002AQMW8 | | ASIN | B0002AQMW8 | | Allergen Information | Apple Free | | Best Sellers Rank | #68,228 in Pet Supplies ( See Top 100 in Pet Supplies ) #594 in Aquarium Water Treatments | | Brand Name | API | | Customer Reviews | 4.3 4.3 out of 5 stars (310) | | Date First Available | June 8, 2005 | | Department | Unisex-Adult | | Global Trade Identification Number | 00317163030356 | | Item Form | Liquid | | Item Type Name | Aquarium pH adjuster | | Item Weight | 9.6 ounces | | Item model number | 35C | | Language | English | | Manufacturer | Mars Fishcare | | Manufacturer | Mars Fishcare | | Manufacturer Part Number | 35C | | Model Number | 35C | | Number of Items | 1 | | Number of Packs | 1 | | Pet Type | Fish | | Product Dimensions | 2.13 x 2.13 x 5 inches; 9.6 ounces | | Target Species | Fish | | UPC | 317163030356 | | Unit Count | 1 Count | ## Product Details - **Brand:** API - **Item Form:** Liquid - **Item Weight:** 9.6 ounces - **Number of Packs:** 1 - **Unit Count:** 1 Count ## Images ![API PROPER pH 6.5 Freshwater Aquarium Water pH Stabilizer 8.5-Ounce Container - Image 1](https://m.media-amazon.com/images/I/817PpQEvZOL.jpg) ## Questions & Answers **Q: I have a 37 gallon tank and used enough for 30 gallons to make up for tank decorations. But the ph stabilized at 3.8. Any idea why this happened?** A: It won’t stabilize overnight. You have to slowly keep building ..remember filtration , water evaporates/added must account…if you do any water, put some in there and test to see if proper ph is reached **Q: Have added twice and Ph is not adjusting. What am I doing wrong?** A: Are you using a liquid test or test strips? Generally test strips are inaccurate. **Q: Why does the package say not to use with live plants?** A: Proper pH 6.5, 7.0 and 7.5 buffer the aquarium to stabilize the pH. As with any true aquarium buffer below 7.8 one of active ingredients is a phosphate based buffer. Any product below 7.8 that is not phosphate-based is simply a pH adjuster, and will not stabilize the pH of your aquarium. While phosphate is normally considered an algae-promoting nutrient, the phosphate level in Proper pH will not promote algae growth. However, the phosphate buffers in Proper pH will bind to essential trace elements, such as iron. Without essential iron, algae and aquatic plants grow poorly. While we have many people that use Proper pH in planted aquariums we do not recommend using it. If you want to adjust pH in planted aquarium we recommend API pH UP or API pH Down. **Q: Is it safe for crayfish?** A: Yes, this can be used for crayfish. ## Frequently Bought Together - API PROPER pH 6.5 Freshwater Aquarium Water pH Stabilizer 8.5-Ounce Container - API STRESS COAT Aquarium Water Conditioner 16-Ounce Bottle - API QUICK START Freshwater and Saltwater Aquarium Nitrifying Bacteria 16-Ounce Bottle --- ## 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.is/products/12525177-api-proper-ph-6-5-freshwater-aquarium-water-ph-stabilizer](https://www.desertcart.is/products/12525177-api-proper-ph-6-5-freshwater-aquarium-water-ph-stabilizer) --- *Product available on Desertcart Iceland* *Store origin: IS* *Last updated: 2026-09-20*