---
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: "HK$409"
currency: HKD
in_stock: true
reviews_count: 8
url: https://www.desertcart.hk/products/514016291-ph-down-for-plants-liquid-ph-adjuster-and-balancer-soil
store_origin: HK
region: Hong Kong
---

# 25% stronger concentration Optimal pH 5.5-6.5 for nutrient uptake 32 fl oz 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 | 32 Ounce

**Brand:** humboldts secret
**Price:** HK$409
**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?** HK$409 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/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

- • **Precision pH Control:** Quickly balances soil, coco, or hydro for peak nutrient absorption.
- • **Boosts Plant Vitality:** Prevents nutrient lockout to fuel lush foliage, strong roots, and abundant harvests.
- • **Clean & Professional Grade:** No dyes or additives; crafted in California by expert growers for reliable results.
- • **Ultra-Concentrated Formula:** Small doses deliver powerful, lasting pH adjustments—save time and product.
- • **Universal Growing Compatibility:** Perfect for soil, coco coir, DWC, NFT, and all hydroponic systems.

## Overview

Humboldts Secret pH Down is a highly concentrated 32 oz liquid phosphoric acid solution designed to rapidly lower and stabilize pH levels between 5.5 and 6.5 across soil, coco, and hydroponic systems. Engineered for professional growers, it prevents nutrient deficiencies and lockout, promoting vigorous plant growth and higher yields without additives or dyes.

## Description

Full description not available

## 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 |
|---------------|-------|
| Brand | Humboldts Secret |
| Item Form | Liquid |
| Liquid Volume | 32 Fluid Ounces |
| Specific Uses For Product | Plant Growth |
| Manufacturer | HS Supplies, LLC |
| Number of Items | 1 |
| UPC | 706199757427 |
| Unit Count | 32.0 Fluid Ounces |
| Product Dimensions | 5 x 2 x 7.5 inches |
| Item Weight | 2.55 pounds |
| ASIN | B0BW3G96VV |
| Item model number | HS-PH-DOWN |
| Date First Available | February 16, 2023 |

## Product Details

- **Brand:** Humboldts Secret
- **Item Form:** Liquid
- **Liquid Volume:** 32 Fluid Ounces
- **Specific Uses For Product:** Plant Growth
- **Manufacturer:** HS Supplies, LLC

## 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/61fdm2mWMZL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Clear color so it’s a little hard to see
*by K***R on August 27, 2025*

Don’t usually buy this brand but I have to say that it works just as well as other brands.

### ⭐⭐⭐⭐⭐ Works well
*by J***K on June 17, 2025*

Great product

### ⭐⭐⭐⭐⭐ Good PH balance
*by T***. on April 6, 2025*

Works great with very few drops on a 10 gallon reservoir.

## 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.hk/products/514016291-ph-down-for-plants-liquid-ph-adjuster-and-balancer-soil](https://www.desertcart.hk/products/514016291-ph-down-for-plants-liquid-ph-adjuster-and-balancer-soil)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-03-02*