--- product_id: 659850844 title: "pH Down for Plants, Liquid pH Adjuster Formula, 8 Ounce | Concentrated Phosphoric Acid Solution, Supports Nutrient Uptake, Soil, Coco & Hydroponics, Maintains 5.5-6.5 pH, Easy Feeding" brand: "humboldts secret" price: "€ 31.22" currency: EUR in_stock: true category: "Humboldts Secret" url: https://www.desertcart.at/products/659850844-ph-down-for-plants-liquid-ph-adjuster-formula-8-ounce store_origin: AT region: Austria --- # 25% stronger concentration Optimal pH 5.5-6.5 balance 8 fl oz liquid formula pH Down for Plants, Liquid pH Adjuster Formula, 8 Ounce | Concentrated Phosphoric Acid Solution, Supports Nutrient Uptake, Soil, Coco & Hydroponics, Maintains 5.5-6.5 pH, Easy Feeding **Brand:** humboldts secret **Price:** € 31.22 **Availability:** ✅ In Stock ## Summary > 🌿 Unlock your garden’s secret weapon for unstoppable growth! ## Quick Answers - **What is this?** pH Down for Plants, Liquid pH Adjuster Formula, 8 Ounce | Concentrated Phosphoric Acid Solution, Supports Nutrient Uptake, Soil, Coco & Hydroponics, Maintains 5.5-6.5 pH, Easy Feeding by humboldts secret - **How much does it cost?** € 31.22 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/659850844-ph-down-for-plants-liquid-ph-adjuster-formula-8-ounce) ## 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 perfect 5.5-6.5 pH for max nutrient uptake and vibrant growth. - • **Clean & Trusted Formula:** No dyes or additives, made in California by expert growers for professional results. - • **Ultra-Concentrated Power:** Up to 25% stronger than competitors—less product, more results. - • **Versatile for Every Grow:** Works seamlessly in soil, coco, hydroponics, DWC, NFT—your all-in-one pH solution. - • **Stress-Free Plants, Bigger Yields:** Prevents nutrient lockout to fuel lush foliage and robust harvests. ## Overview Humboldts Secret pH Down is a highly concentrated liquid formula designed to quickly and precisely lower pH levels in soil, coco, and hydroponic systems. With up to 25% greater strength than competitors, it ensures optimal nutrient absorption by maintaining a pH range of 5.5 to 6.5, preventing deficiencies and promoting healthier, more productive plants. Made with pure phosphoric acid and no additives, this 8-ounce solution is trusted by growers for consistent, professional-grade results across all growing mediums. ## Description desertcart.com : Humboldts Secret pH Down for Plants, Liquid pH Adjuster Formula, 8 Ounce | 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 | B0DFN2JDB2 | | Best Sellers Rank | #31,409 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #884 in Garden Fertilizers | | Brand Name | Humboldts Secret | | Coverage | Medium | | Customer Reviews | 4.6 4.6 out of 5 stars (478) | | Item Form | Liquid | | Item Weight | 10.08 ounces | | Liquid Volume | 8 fluid ounces | | Manufacturer | Humboldts Secret | | Model Number | pHDown8oz | | Number of Items | 1 | | Target Species | plants, trees, flowers, bushes, lawns | | UPC | 850058984438 | | Unit Count | 8 Fluid Ounces | ## Product Details - **Brand:** Humboldts Secret - **Item Form:** Liquid - **Item Weight:** 10.08 ounces - **Liquid Volume:** 8 fluid ounces - **Manufacturer:** Humboldts Secret ## Images ![pH Down for Plants, Liquid pH Adjuster Formula, 8 Ounce | Concentrated Phosphoric Acid Solution, Supports Nutrient Uptake, Soil, Coco & Hydroponics, Maintains 5.5-6.5 pH, Easy Feeding - Image 1](https://m.media-amazon.com/images/I/616qVWfyuwL.jpg) ## Available Options This product comes in different **Size** options. ## Frequently Bought Together - Humboldts Secret pH Down | Liquid pH Plant Balancer for Soil & Hydroponics Growing System (8 Ounce) - VIVOSUN Digital pH and TDS Meter Kits, 0.01pH High Accuracy Pen Type pH Meter ± 2% Readout Accuracy 3-in-1 TDS EC Temperature Meter for Hydroponics, Pool and Aquarium, Yellow Blue, UL Certified - Humboldts Secret Set of A & B Liquid Hydroponics Fertilizer - World's Best Nutrient System – Hydroponic Nutrients for Outdoor, Indoor Plants – Supports Vegetative and Flowering Stages of Plants --- ## 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/659850844-ph-down-for-plants-liquid-ph-adjuster-formula-8-ounce](https://www.desertcart.at/products/659850844-ph-down-for-plants-liquid-ph-adjuster-formula-8-ounce) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-08-27*