---
product_id: 514016291
title: "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: "€ 75.68"
currency: EUR
in_stock: true
reviews_count: 9
category: "Humboldts Secret"
url: https://www.desertcart.es/products/514016291-ph-down-for-plants-liquid-ph-adjuster-and-balancer-soil
store_origin: ES
region: Spain
---

# universal grow medium compatibility highly concentrated formula pH balance precision 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:** € 75.68
**Availability:** ✅ In Stock

## Summary

> 🌿 Master your grow with precision pH power!

## Quick Answers

- **What is this?** 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?** € 75.68 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/514016291-ph-down-for-plants-liquid-ph-adjuster-and-balancer-soil)

## 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

- • **Grower-Trusted Quality 🏆:** Formulated by experts with pure phosphoric acid, no additives, proudly made in California for professional results.
- • **Precision pH Control ⚖️:** Quickly fine-tune your soil or hydroponic pH to the ideal 5.5-6.5 range for maximum nutrient uptake.
- • **Stress-Free Plant Health 🌿:** Prevents nutrient lockout and deficiencies, ensuring lush foliage, robust roots, and bountiful harvests.
- • **All-Grow Medium Versatility 🌱:** Perfectly compatible with soil, coco coir, DWC, NFT, and more—one solution for every garden setup.
- • **Ultra-Concentrated Efficiency 💧:** Up to 25% stronger than competitors—use less, save more, and get lasting results with every drop.

## Overview

Humboldts Secret pH Down is a 32-ounce concentrated phosphoric acid liquid designed to rapidly and precisely lower pH in soil, coco, and hydroponic systems. Its potent formula ensures optimal nutrient absorption by maintaining pH between 5.5 and 6.5, promoting healthier, stress-free plant growth across all mediums. Trusted by growers, it delivers professional-grade results with minimal use, supporting stronger roots, vibrant foliage, and higher yields.

## Description

desertcart.com : 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 : Patio, Lawn & Garden

Review: Humboldt ph dn - Works great and I use less then other brands per feeding
Review: Quality product - Excellent product highly recommended!!!

## 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 | #17,713 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #685 in Garden Fertilizers |
| Brand | Humboldts Secret |
| Date First Available | February 16, 2023 |
| Item Form | Liquid |
| Item Weight | 2.58 pounds |
| Item model number | HS-PH-DOWN |
| Liquid Volume | 32 Fluid Ounces |
| Manufacturer | HS Supplies, LLC |
| Number of Items | 1 |
| Product Dimensions | 5 x 2 x 7.5 inches |
| Specific Uses For Product | Plant Growth |
| 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

![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

### ⭐⭐⭐⭐⭐ Humboldt ph dn
*by R***N on November 4, 2025*

Works great and I use less then other brands per feeding

### ⭐⭐⭐⭐⭐ Quality product
*by R***E on December 29, 2025*

Excellent product highly recommended!!!

### ⭐⭐⭐⭐⭐ Lowers Ph.
*by S***N on October 7, 2025*

I use this to lower the Ph in my water prior to watering my plants.

## 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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**Shop now:** [https://www.desertcart.es/products/514016291-ph-down-for-plants-liquid-ph-adjuster-and-balancer-soil](https://www.desertcart.es/products/514016291-ph-down-for-plants-liquid-ph-adjuster-and-balancer-soil)

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*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-04-23*