---
product_id: 659850844
title: "pH Down for Plants | Liquid pH Adjuster and Balancer for Soil Coco Hydroponics | Concentrated Phosphoric Acid Solution Supporting Nutrient Uptake and Strong Growth | 8 Ounce"
brand: "humboldts secret"
price: "€ 17.70"
currency: EUR
in_stock: true
reviews_count: 9
category: "Humboldts Secret"
url: https://www.desertcart.ie/products/659850844-ph-down-for-plants-liquid-ph-adjuster-and-balancer-soil
store_origin: IE
region: Ireland
---

# 25% stronger concentration Optimal pH 5.5-6.5 balance Versatile liquid formula pH Down for Plants | Liquid pH Adjuster and Balancer for Soil Coco Hydroponics | Concentrated Phosphoric Acid Solution Supporting Nutrient Uptake and Strong Growth | 8 Ounce

**Brand:** humboldts secret
**Price:** € 17.70
**Availability:** ✅ In Stock

## Summary

> 🌿 Unlock your garden’s full potential with precision pH mastery!

## 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 | 8 Ounce by humboldts secret
- **How much does it cost?** € 17.70 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/659850844-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

- • **Precision pH Control:** Quickly lowers pH to ideal 5.5-6.5 range for maximum nutrient uptake.
- • **Boosts Plant Vitality:** Prevents nutrient lockout, supports strong roots, lush foliage, and abundant harvests.
- • **Universal Compatibility:** Perfect for soil, coco, hydroponics (DWC, NFT), and all grow mediums.
- • **Pure & Professional Grade:** Made with high-grade phosphoric acid, no dyes or additives, trusted by expert growers.
- • **Ultra-Concentrated Formula:** Up to 25% stronger than competitors, requiring less product per use.

## Overview

Humboldts Secret pH Down is a highly concentrated liquid 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, promoting healthier, more vigorous plant growth. Its versatile formula works across all growing mediums, delivering reliable, efficient results with minimal product use.

## 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 | 8 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

- 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 | #16,314 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #502 in Garden Fertilizers |
| Brand | Humboldts Secret |
| Date First Available | August 29, 2024 |
| Item Form | Liquid |
| Item Weight | 10.1 ounces |
| Item model number | pHDown8oz |
| Liquid Volume | 8 Fluid Ounces |
| Manufacturer | Humboldts Secret |
| Number of Items | 1 |
| Product Dimensions | 2 x 2 x 6 inches |
| UPC | 850058984438 |
| Unit Count | 8.0 Fluid Ounces |

## Product Details

- **Brand:** Humboldts Secret
- **Item Form:** Liquid
- **Item Weight:** 0.63 Pounds
- **Liquid Volume:** 8 Fluid Ounces
- **Manufacturer:** Humboldts Secret

## Images

![pH Down for Plants | Liquid pH Adjuster and Balancer for Soil Coco Hydroponics | Concentrated Phosphoric Acid Solution Supporting Nutrient Uptake and Strong Growth | 8 Ounce - Image 1](https://m.media-amazon.com/images/I/51jMKs10DiL.jpg)

## 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 (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.ie/products/659850844-ph-down-for-plants-liquid-ph-adjuster-and-balancer-soil](https://www.desertcart.ie/products/659850844-ph-down-for-plants-liquid-ph-adjuster-and-balancer-soil)

---

*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-03*