--- product_id: 5951852 title: "Flourish Potassium 250 mL / 8.5 fl. oz." brand: "seachem" price: "€ 28.55" currency: EUR in_stock: true category: "Seachem" url: https://www.desertcart.at/products/5951852-flourish-potassium-250-ml-8-5-fl-oz store_origin: AT region: Austria --- # Boosts rapid plant growth Phosphate & nitrate free formula 50,000 mg/L potassium concentration Flourish Potassium 250 mL / 8.5 fl. oz. **Brand:** seachem **Price:** € 28.55 **Availability:** ✅ In Stock ## Summary > 🌿 Unlock lush growth with every drop — don’t let your plants miss out! ## Quick Answers - **What is this?** Flourish Potassium 250 mL / 8.5 fl. oz. by seachem - **How much does it cost?** € 28.55 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/5951852-flourish-potassium-250-ml-8-5-fl-oz) ## Best For - seachem enthusiasts ## Why This Product - Trusted seachem brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Clean & Green:** Formulated without phosphate or nitrate, ensuring pure, algae-free water clarity. - • **Growth Guardian:** Prevents potassium depletion in fast-growing planted tanks for sustained vibrancy. - • **Potassium Powerhouse:** Delivers a potent 50,000 mg/L potassium boost to supercharge your aquatic plants’ growth. - • **Seamless Integration:** Perfectly complements the entire Seachem Flourish line and Fluorite gravel for a holistic plant care system. - • **Trusted by Thousands:** Backed by 3,100+ glowing reviews and a 4.8-star rating—join the thriving planted aquarium community. ## Overview Seachem Flourish Potassium is a high-concentration liquid supplement (50,000 mg/L) designed to prevent potassium depletion in freshwater planted aquariums. Free from phosphate and nitrate, it supports vigorous plant growth without promoting algae, integrates seamlessly with Seachem’s Flourish product line, and is highly rated by thousands of aquarium enthusiasts. ## Description Sachem Flourish Potassium contains 50,000 mg/L of potassium suitable for the natural freshwater aquarium. Potassium is one of several elements that are vitally important to maintaining a vigorous level of growth in a planted aquarium. Potassium can become depleted in a rapidly growing system or when the source water has a low mineral content. In these cases potassium could become the limiting factor to growth. Use Flourish Potassium to prevent potassium depletion and maintain the highest level of growth. Flourish Potassium is an integral component of Sachem's plant products and is recommended for use with the entire Flourish line as well as our Fluorite gravel. Contains no phosphate or nitrate. ## Features - Potassium supplement - For planted aquariums - Contains no phosphate or nitrate ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0002A5WRY | | Allergen Information | Yam Free | | Best Sellers Rank | #12,719 in Pet Supplies ( See Top 100 in Pet Supplies ) #95 in Aquarium Water Treatments | | Brand | Seachem | | Brand Name | Seachem | | Customer Reviews | 4.8 out of 5 stars 3,106 Reviews | | Global Trade Identification Number | 00000116046602 | | Included Components | Seachem Flourish Potassium 250ml | | Item Form | Liquid | | Item Type Name | Seachem Flourish Potassium 250ml | | Item Weight | 8.8 ounces | | Liquid Volume | 250 ml | | Manufacturer | Seachem Laboratories, Inc. | | Manufacturer Part Number | 466 | | Model Number | 466 | | Number of Items | 1 | | Pet Type | Fish | | Target Species | Fish | | UPC | 015568977138 000116046602 | | Unit Count | 1 Count | | Warranty Description | Warranty | ## Product Details - **Brand:** Seachem - **Item Form:** Liquid - **Item Weight:** 8.8 ounces - **Liquid Volume:** 250 ml - **Unit Count:** 1 Count ## Images ![Flourish Potassium 250 mL / 8.5 fl. oz. - Image 1](https://m.media-amazon.com/images/I/51mOdi91cQL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Is this safe for bettas?** A: Yes! At the moment, my lonely Betta has been living in a heavily planted 40 gallon tank with some trumpet snails. I have been using only seachem products and they have not not affected him nor the snails, negatively. However use caution when dosing - follow directions. If tank isn’t heavily planted I would half the doses... **Q: Can I use flourish potassium on hibiscus plants?** A: Would work on any plants I would think. **Q: How many ml do i use for a 72 gal and a 75 gal tank?** A: 10 ml per 60 gal. 2 - 3 times a week per the instructions. **Q: Will it work on watermelons** A: This product is intended for aquarium use. I suppose it would work in a garden scenario, but is expensive by comparison to garden fertilizers (which are great for plants, but generally kill fish if you put them in an aquarium). ## Frequently Bought Together - Seachem Flourish Potassium 250ml - Seachem Flourish Nitrogen 250ml --- ## 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.at/products/5951852-flourish-potassium-250-ml-8-5-fl-oz](https://www.desertcart.at/products/5951852-flourish-potassium-250-ml-8-5-fl-oz) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-09-19*