---
product_id: 585419456
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: "€ 106.90"
currency: EUR
in_stock: true
reviews_count: 5
category: "Humboldts Secret"
url: https://www.desertcart.ie/products/585419456-humboldts-secret-ph-down-for-plants-liquid-ph-adjuster-balancer
store_origin: IE
region: Ireland
---

# 25% stronger concentration Optimal pH 5.5-6.5 for nutrient uptake Versatile for soil, coco & hydro 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:** € 106.90
**Availability:** ✅ In Stock

## Summary

> 🌿 Elevate your grow game with precision pH mastery!

## 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?** € 106.90 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/585419456-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

- • **Trusted by Growers:** Crafted in California by experts, delivering consistent, stress-free growth season after season.
- • **Precision pH Control:** Quickly balances pH to unlock full nutrient potential and prevent deficiencies.
- • **Clean & Pure Composition:** No dyes or additives—just high-grade phosphoric acid for professional-grade results.
- • **Ultra-Concentrated Formula:** Use less, save more—up to 25% stronger than competitors for efficient dosing.
- • **Universal Growing Compatibility:** Perfectly adapts to soil, coco coir, hydroponics, DWC, NFT, and more.

## Overview

Humboldts Secret pH Down is a highly concentrated phosphoric acid solution designed to rapidly and precisely lower pH levels in soil, coco, and hydroponic systems. Engineered for professional growers, it ensures optimal nutrient absorption by maintaining pH between 5.5 and 6.5, preventing nutrient lockout and promoting vigorous plant growth. Its clean formula contains no dyes or additives, making it safe for all plant types and growing methods. Trusted for efficiency and reliability, this 32-ounce solution delivers commercial-grade performance that saves time and product usage while supporting stronger roots, lush foliage, and abundant harvests.

## Description

Humboldts Secret pH Down is the trusted choice for growers who want complete control, consistency, and professional level results in every crop. Designed by growers for growers, our commercial grade formula is made with high quality phosphoric acid and contains no dyes or additives so nothing unwanted comes in contact with your plants. Whether you are cultivating vegetables, herbs, or flowers, maintaining the correct pH level is essential for nutrient absorption and plant vitality. This product works seamlessly as part of your regular pH adjust process, helping you prevent nutrient lockout and keep your plants thriving from the earliest stage through harvest. Our concentrated formula means you use less product for the same effect which makes it a smart investment that saves both time and money. It is not only about bringing the pH down, it is about creating an environment where your pH nutrients remain fully available to your plants which results in stronger roots, healthier foliage, and more abundant blooms. Suitable for soil, coco, and water based systems, Humboldts Secret pH Down integrates easily with any hydroponics solution or feeding schedule, delivering precise and measurable results every time. If you use a hydroponic solution for your growing system, maintaining a consistent and optimal pH is critical and this product provides the stability required to avoid problems caused by pH swings. Whether you need to pH lower slightly for delicate seedlings or make more significant adjustments in a mature grow, our formula works quickly and effectively without harming beneficial microbes or delicate plant tissue. Growers in deep water culture, nutrient film technique, aeroponics, and traditional soil gardens trust Humboldts Secret for reliable performance season after season. Each drop is designed for maximum efficiency so you can be confident your plants are getting exactly what they need to reach their full potential.

Review: Works great and I use less then other brands per feeding
Review: Perfect for plant health and it works for meny grows .

## Features

- 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 |
| Customer Reviews | 4.6 4.6 out of 5 stars (352) |
| Date First Available | 17 May 2023 |
| Item model number | HS-PH-DOWN |
| Manufacturer | HS Supplies, LLC |
| Product Dimensions | 12.7 x 5.08 x 19.05 cm; 1.17 kg |

## Product Details

- **Brand:** Humboldts Secret
- **Item form:** Liquid
- **Item weight:** 2.58 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/61fdm2mWMZL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by R***N on 4 November 2025*

Works great and I use less then other brands per feeding

### ⭐⭐⭐⭐⭐ Review
*by G***Y on 26 December 2025*

Perfect for plant health and it works for meny grows .

### ⭐⭐⭐⭐⭐ Review
*by R***E on 29 December 2025*

Excellent product highly recommended!!!

## 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

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-02-26*