--- product_id: 48174941 title: "pH Down Freshwater Aquarium Water pH Reducing Solution, 118 ml Bottle" brand: "api" price: "€ 22.00" currency: EUR in_stock: true reviews_count: 8 category: "Api" url: https://www.desertcart.pt/products/48174941-ph-down-freshwater-aquarium-water-ph-reducing-solution-118-ml store_origin: PT region: Portugal --- # Phosphate-free, plant-safe Fish-friendly formula Precise pH control pH Down Freshwater Aquarium Water pH Reducing Solution, 118 ml Bottle **Brand:** api **Price:** € 22.00 **Availability:** ✅ In Stock ## Summary > 🐟 Master your aquarium’s pH like a pro — because your fish deserve the best! ## Quick Answers - **What is this?** pH Down Freshwater Aquarium Water pH Reducing Solution, 118 ml Bottle by api - **How much does it cost?** € 22.00 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/48174941-ph-down-freshwater-aquarium-water-ph-reducing-solution-118-ml) ## 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 - • **Trusted Legacy:** Backed by 50+ years of API innovation, ensuring reliable and research-driven aquarium care. - • **Tailored pH Balance:** Adjust your freshwater aquarium’s pH with pinpoint accuracy to create the perfect aquatic environment. - • **Algae-Free Assurance:** Phosphate-free formula ensures your tank stays clear and vibrant without unwanted algae blooms. - • **Slow & Steady Correction:** Gradually neutralizes alkaline substances to avoid shocking your aquatic inhabitants. - • **Safe for All Aquatic Life:** Gentle on fish and plants, maintaining a healthy ecosystem for your tropical community. ## Overview API pH Down Freshwater Aquarium Water pH Reducing Solution (118 ml) offers precise, phosphate-free pH adjustment for freshwater tanks. Designed to safely lower alkaline water levels without promoting algae growth, it supports a thriving environment for fish and plants. Ideal for weekly pH maintenance, this trusted formula from API ensures your aquatic ecosystem stays balanced and healthy. ## Description Product 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. Different geographies have different tap water conditions with different pH levels, while fish require a specific pH level to thrive. A pH of 7.0 is ideal when keeping a community aquarium containing a variety of tropical fish. Goldfish and livebearers prefer a pH of 7.5. Many desertcartian fish, like angelfish and neon tetras, prefer a pH of 6.5 to 6.8. Mollies and swordtails thrive at pH 7.2 to 7.5. API pH DOWN Freshwater Aquarium Water pH Reducing Solution lowers aquarium pH in freshwater aquariums to desired level. Safe for fish and plants. Use 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. Directions 1. Test water weekly using a separate test kit. 2. If the pH level is too high, use the API pH DOWN Freshwater Aquarium Water pH Reducing Solution to correct it. 3. Slowly neutralize alkaline substances that cause high water pH. 4. Use sparingly, as directed, to avoid lowering the pH below the desired level. 5. Always follow the instructions on the product label and packaging. Box Contains 1 x API pH Down Aquarium Freshwater pH Reducing Solution 118 ml Review: Great product - Came quick, works fine Review: It’s a must product - The best product to keep the ph down. Just one or 2 small drops otherwise you end up killing your fish. Great for fish health ## Features - Causes severe skin burns and eye damage. - May be corrosive to metals. - May cause cancer. - Contains one (1) API pH DOWN Freshwater Aquarium Water pH Reducing Solution 118 ml Bottle - Lowers freshwater aquarium water pH with a phosphate-free formula - Does not promote algae growth with pH adjustments and is safe for plants and fish - Slowly neutralizes alkaline substances that cause high water pH - Test water weekly and use to correct pH level in freshwater aquariums ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0002AQMV4 | | Best Sellers Rank | 5,189 in Pet Supplies ( See Top 100 in Pet Supplies ) 56 in Aquarium Water Treatments | | Brand | API | | Brand Name | API | | Country Of Origin | United Kingdom | | Customer Reviews | 4.6 out of 5 stars 693 Reviews | | Global Trade Identification Number | 00317163030301 | | Item Form | Liquid | | Item Weight | 0.3 Pounds | | Item form | Liquid | | Item weight | 0.3 Pounds | | Liquid Volume | 118 Millilitres | | Liquid volume | 118 Millilitres | | Manufacturer | API | | Manufacturer Part Number | 30C | | Model Number | 30C | | Number of Packs | 1 | | Pet Type | Fish | | Target Species | Fish | | UPC | 317163030301 | | Unit Count | 118.0 millilitre | | Unit count | 118.0 millilitre | ## Product Details - **Brand:** API - **Item form:** Liquid - **Item weight:** 0.3 Pounds - **Liquid volume:** 118 Millilitres - **Number of Packs:** 1 ## Images ![pH Down Freshwater Aquarium Water pH Reducing Solution, 118 ml Bottle - Image 1](https://m.media-amazon.com/images/I/71bFz9XJJBL.jpg) ## Available Options This product comes in different **Pattern, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great product *by A***Y on 17 April 2026* Came quick, works fine ### ⭐⭐⭐⭐⭐ It’s a must product *by V***A on 24 March 2026* The best product to keep the ph down. Just one or 2 small drops otherwise you end up killing your fish. Great for fish health ### ⭐⭐⭐⭐⭐ Strong *by I***O on 25 May 2026* Use sparingly, very strong. ## Frequently Bought Together - API pH DOWN Freshwater Aquarium Water pH Reducing Solution 4-Ounce Bottle - API AMMONIA 130-Test Freshwater and Saltwater Aquarium Water Test Kit --- ## 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.pt/products/48174941-ph-down-freshwater-aquarium-water-ph-reducing-solution-118-ml](https://www.desertcart.pt/products/48174941-ph-down-freshwater-aquarium-water-ph-reducing-solution-118-ml) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-09-23*