--- product_id: 514016291 title: "Humboldts Secret pH Down for Plants | Liquid pH Adjuster and Balancer for Soil Coco Hydroponics | Concentrated Phosphoric Acid Solution Supporting Nutrient Uptake and Strong Growth | 32 Ounce" brand: "humboldts secret" price: "₱4620" currency: PHP in_stock: true reviews_count: 9 category: "Humboldts Secret" url: https://www.desertcart.ph/products/514016291-humboldts-secret-ph-down-for-plants-liquid-ph-adjuster-balancer store_origin: PH region: Philippines --- # 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 and Balancer for Soil Coco Hydroponics | Concentrated Phosphoric Acid Solution Supporting Nutrient Uptake and Strong Growth | 32 Ounce **Brand:** humboldts secret **Price:** ₱4620 **Availability:** ✅ In Stock ## Summary > 🌱 Master your grow with precision pH power — because your plants deserve the secret advantage! ## Quick Answers - **What is this?** Humboldts Secret pH Down for Plants | Liquid pH Adjuster and Balancer for Soil Coco Hydroponics | Concentrated Phosphoric Acid Solution Supporting Nutrient Uptake and Strong Growth | 32 Ounce by humboldts secret - **How much does it cost?** ₱4620 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ph](https://www.desertcart.ph/products/514016291-humboldts-secret-ph-down-for-plants-liquid-ph-adjuster-balancer) ## 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:** Fine-tune your grow medium’s pH to the ideal 5.5-6.5 range for maximum nutrient absorption and vibrant plant health. - • **Grower-Trusted Quality:** Crafted in California with pure phosphoric acid, no additives or dyes—professional-grade results for every plant enthusiast. - • **Ultra-Concentrated Formula:** Up to 25% stronger than competitors, requiring just a few drops to balance your solution—saving time and money. - • **Stress-Free Growth Foundation:** Prevents nutrient lockout and deficiencies, promoting strong roots, lush foliage, and abundant harvests. - • **Universal Growing Compatibility:** Seamlessly works with soil, coco coir, DWC, NFT, and all hydroponic systems for year-round thriving gardens. ## Overview Humboldts Secret pH Down is a 32-ounce concentrated phosphoric acid solution designed to quickly and effectively lower pH in soil, coco, and hydroponic systems. Engineered for professional growers, it optimizes nutrient uptake by maintaining an ideal pH range of 5.5 to 6.5, supports strong root development and abundant yields, and is up to 25% stronger than many competitors, ensuring efficient use with minimal product. Trusted for its purity and versatility, it’s the go-to pH adjuster for serious gardeners seeking consistent, vibrant growth. ## Description Product description Product Comparisons pH Up & Down pH Down pH Up Base A & B Golden Tree Sweet & Sticky Review: It works fabulously - I've been doing hydroponic systems for over 20 years and this product works better the any ph down I've used. Review: This stuff is great! - The pH on my cannabis plants was at about 7 1/2 almost 8. They were not taking up nutrients like they should, which is obvious by their stunted growth and within one water and using pH down it… Problem solved! Perfect, 6.7 PH. All I did was mix my feeding solution take the pH, Then add pH down until the pH was at around 3 1/2 which I figured is half of the approximate 6 1/2 I was looking to get. And it got me there right on the line. The only problem with this product is there are no real directions. You kind of have to do trial by error and let me tell you folks please err on the side of caution. This is straight acid that will definitely burn your plants so do not apply this directly. Do not apply this in high doses. I would say start with a cap full in a gallon of your feeding solution and then go from there, adding more until you get to where you want to be. That said, I kind of understand why the directions are the way they are because every solution is a different pH, so there is no perfect amount. It’s always going to be based on your water quality and the pH of your nutrient base. At any rate, I will tell you that this product works absolutely great. I would avoid getting it on the plant itself and apply only to the soil. Happy growing.✌️🙏❤️🤩🌱🌳 ## 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 | B0BW3G96VV | | Best Sellers Rank | #36,771 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1,032 in Garden Fertilizers | | Brand | Humboldts Secret | | Brand Name | Humboldts Secret | | Coverage | Medium | | Customer Reviews | 4.6 out of 5 stars 456 Reviews | | Item Form | Liquid | | Item Weight | 2.58 Pounds | | Liquid Volume | 32 Fluid Ounces | | Manufacturer | HS Supplies, LLC | | Mixing Ratio | a few drops per unit of nutrient solution | | Model Number | HS-PH-DOWN | | Number of Items | 1 | | Number of Packs | 1 | | Specific Uses For Product | Plant Growth | | Target Species | plants | | UPC | 706199757427 | | Unit Count | 32.0 Fluid Ounces | ## Product Details - **Brand:** Humboldts Secret - **Item Form:** Liquid - **Item Weight:** 2.6 Pounds - **Liquid Volume:** 32 Fluid Ounces - **Specific Uses For Product:** Plant Growth ## Images ![Humboldts Secret pH Down for Plants | Liquid pH Adjuster and Balancer for Soil Coco Hydroponics | Concentrated Phosphoric Acid Solution Supporting Nutrient Uptake and Strong Growth | 32 Ounce - Image 1](https://m.media-amazon.com/images/I/71170RJlQnL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ It works fabulously *by J***. on May 16, 2026* I've been doing hydroponic systems for over 20 years and this product works better the any ph down I've used. ### ⭐⭐⭐⭐⭐ This stuff is great! *by R***H on June 15, 2023* The pH on my cannabis plants was at about 7 1/2 almost 8. They were not taking up nutrients like they should, which is obvious by their stunted growth and within one water and using pH down it… Problem solved! Perfect, 6.7 PH. All I did was mix my feeding solution take the pH, Then add pH down until the pH was at around 3 1/2 which I figured is half of the approximate 6 1/2 I was looking to get. And it got me there right on the line. The only problem with this product is there are no real directions. You kind of have to do trial by error and let me tell you folks please err on the side of caution. This is straight acid that will definitely burn your plants so do not apply this directly. Do not apply this in high doses. I would say start with a cap full in a gallon of your feeding solution and then go from there, adding more until you get to where you want to be. That said, I kind of understand why the directions are the way they are because every solution is a different pH, so there is no perfect amount. It’s always going to be based on your water quality and the pH of your nutrient base. At any rate, I will tell you that this product works absolutely great. I would avoid getting it on the plant itself and apply only to the soil. Happy growing.✌️🙏❤️🤩🌱🌳 ### ⭐⭐⭐⭐⭐ Yep *by B***6 on April 30, 2026* As promised ## Frequently Bought Together - Humboldts Secret pH Down | Liquid pH Plant Balancer for Soil & Hydroponics Growing System - Humboldts Secret Tree Trunk - Silicate Additive - Advanced Nutrients - Helps Plants Flourish - Indoor Plant Food - Hydroponic Nutrients - Liquid Fertilizer (32 Ounce) - Humboldts Secret Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Enhance Aroma and Flavor of Plants – Potting Soil for Indoor Plants – Energy for Plants – 32 Ounces --- ## 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.ph/products/514016291-humboldts-secret-ph-down-for-plants-liquid-ph-adjuster-balancer](https://www.desertcart.ph/products/514016291-humboldts-secret-ph-down-for-plants-liquid-ph-adjuster-balancer) --- *Product available on Desertcart Philippines* *Store origin: PH* *Last updated: 2026-07-06*