--- product_id: 638201633 title: "Humboldts Secret pH Down for Plants, Liquid pH Adjuster Formula, 2.5 Gallon" brand: "humboldts secret" price: "4859 kr" currency: NOK in_stock: true category: "Humboldts Secret" url: https://www.desertcart.no/products/638201633-humboldts-secret-ph-down-for-plants-liquid-ph-adjuster-formula store_origin: NO region: Norway --- # Optimizes pH 5.5-6.5 for nutrient uptake Versatile for soil, coco & hydroponics Highly concentrated phosphoric acid Humboldts Secret pH Down for Plants, Liquid pH Adjuster Formula, 2.5 Gallon **Brand:** humboldts secret **Price:** 4859 kr **Availability:** ✅ In Stock ## Summary > 🌿 Unlock your garden’s secret weapon for flawless growth! ## Quick Answers - **What is this?** Humboldts Secret pH Down for Plants, Liquid pH Adjuster Formula, 2.5 Gallon by humboldts secret - **How much does it cost?** 4859 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.no](https://www.desertcart.no/products/638201633-humboldts-secret-ph-down-for-plants-liquid-ph-adjuster-formula) ## Best For - humboldts secret enthusiasts ## Why This Product - Trusted humboldts secret brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Precision pH Control:** Maintain the perfect 5.5-6.5 pH range for unstoppable plant vitality. - • **Ultra-Concentrated Formula:** Up to 25% stronger than competitors—less product, more power. - • **Trusted Grower-Grade Quality:** Made in California with pure phosphoric acid—no dyes, no fillers. - • **Stress-Free Growth Foundation:** Prevents nutrient lockout to fuel lush foliage and bountiful harvests. - • **Universal Growing Compatibility:** Seamlessly works with soil, coco coir, DWC, NFT & hydroponic systems. ## Overview Humboldts Secret pH Down is a professional-grade, highly concentrated liquid formula designed to quickly and precisely lower pH levels in soil, coco, and hydroponic systems. Maintaining an optimal pH range of 5.5 to 6.5, it prevents nutrient deficiencies and supports vigorous plant growth from seedling to harvest. Trusted by growers, this 2.5-gallon phosphoric acid solution delivers efficient, reliable results with minimal use, ensuring healthier roots, stronger stems, and abundant yields year-round. ## Description desertcart.com : Humboldts Secret pH Down for Plants, Liquid pH Adjuster Formula, 2.5 Gallon | Concentrated Phosphoric Acid Solution, Supports Nutrient Uptake, Soil, Coco & Hydroponics, Maintains 5.5-6.5 pH, Easy Feeding : Patio, Lawn & Garden ## Features - Packaging Update: You may receive previous or updated packaging during our transition. Same formula, same performance. Balance Your Grow Medium Fast - Our Humboldts Secret pH Down quickly and effectively lower pH in soil or coco to the optimal range for nutrient absorption. Prevents deficiencies and keeps plants stress-free while creating the right foundation for strong roots lush foliage and abundant harvests. - Fuel Stronger Healthier Growth: Maintain precise plant pH balance between 5.5 and 6.5 to prevent nutrient lockout and maximize vitality. Works for vegetables flowers and herbs in any medium helping your garden thrive from seedling to full production with consistent vibrant growth. - Highly Concentrated and Efficient: Just a small amount of our hydroponic pH down makes powerful lasting adjustments saving you time and money. Up to 25% stronger than some competitors this commercial grade formula ensures reliable results with minimal product use. - Versatile for All Growing Methods: Use Humboldts Secret pH Down in soil hydroponic systems like DWC and NFT coco coir or other grow mediums. Works seamlessly with your nutrient solution to support balanced feeding healthy stems and increased yields year round. - Expert Made Quality You Can Trust: Designed by growers for growers our concentrated pH down for plants uses high grade phosphoric acid and contains no dyes or additives. Proudly manufactured in California it delivers professional level results for every type of garden. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CQ64MWBL | | Best Sellers Rank | #34,050 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #81 in Hydroponic Nutrients & Additives | | Brand | Humboldts Secret | | Brand Name | Humboldts Secret | | Coverage | Medium | | Customer Reviews | 4.6 out of 5 stars 481 Reviews | | Global Trade Identification Number | 00850058984117 | | Item Form | Liquid | | Item Highlight | Concentrated Phosphoric Acid Solution, Supports Nutrient Uptake, Soil, Coco & Hydroponics, Maintains 5.5-6.5 pH, Easy Feeding | | Liquid Volume | 320 fluid ounces | | Manufacturer | HS Supplies, LLC | | Model Number | 850058984117 | | Number of Items | 1 | | Specific Uses For Product | Plant care, maintaining optimal pH level for plant growth | | Target Species | plants | | UPC | 850058984117 | | Unit Count | 320 Fluid Ounces | ## Product Details - **Brand:** Humboldts Secret - **Global Trade Identification Number:** 00850058984117 - **Item Form:** Liquid - **Liquid Volume:** 320 Fluid Ounces - **Specific Uses For Product:** Plant care, maintaining optimal pH level for plant growth ## Images ![Humboldts Secret pH Down for Plants, Liquid pH Adjuster Formula, 2.5 Gallon - Image 1](https://m.media-amazon.com/images/I/71i92b2ek8L.jpg) ![Humboldts Secret pH Down for Plants, Liquid pH Adjuster Formula, 2.5 Gallon - Image 2](https://m.media-amazon.com/images/I/71vkfEznPCL.jpg) ![Humboldts Secret pH Down for Plants, Liquid pH Adjuster Formula, 2.5 Gallon - Image 3](https://m.media-amazon.com/images/I/81YcAkdxBeL.jpg) ![Humboldts Secret pH Down for Plants, Liquid pH Adjuster Formula, 2.5 Gallon - Image 4](https://m.media-amazon.com/images/I/810oylQ79wL.jpg) ![Humboldts Secret pH Down for Plants, Liquid pH Adjuster Formula, 2.5 Gallon - Image 5](https://m.media-amazon.com/images/I/91TFAK06jGL.jpg) ## Available Options This product comes in different **Size** options. --- ## 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.no/products/638201633-humboldts-secret-ph-down-for-plants-liquid-ph-adjuster-formula](https://www.desertcart.no/products/638201633-humboldts-secret-ph-down-for-plants-liquid-ph-adjuster-formula) --- *Product available on Desertcart Norway* *Store origin: NO* *Last updated: 2026-09-21*