What is the amount per gallon mixing ratio?

I use up to 3-4ml per gallon sometimes, depending on my nutrients, water and stage of plant growth. It will vary depending on what you're growing and where your particular plant's needs fall on the nutrient/ph charts. For hydroponics/coir it is recommended by manufacturer to range between 5.5 and 6.5.

can you list ingredients with %. Thank you!

exact amounts are a trade secret however the MSDS on this states:Phosphoric acid 10 - 30%Ammonium dihydrogenorthophosphate 5 - 10%Citric acid 5 - 10%in comparison the dyna-gro ph down has:Phosphoric Acid H3PO4 33%Nitric Acid HNO3 11.5%That being said there are benefits to some of these ingredients. N-NitrogenP-PhosphorusK-PotassiumPhosphoric acid provides: PAmmonium dihydrogenorthophosphate provides: N and PCitric acid: other than lowering ph, does nothing useful. made from oxygen and hydrogen not in any usable form as far as I can find.Nitric Acid provides: NOverall either product seems to provide similar benefits.Dyna-gro is half the cost.

ingredients? Concentration?

It’s not organic if that’s what you mean ingredients. I haven’t used this in a long time. I want to say I’d use like 20ml for 5 gallons. I switched to another branf

Is this safe for aquaponics systems?

I would think so. I use it to lower the pH of the water I use to water my plants sometimes, both inside and out.

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

GH pH Down Paper Down 3.78L

Product ID: 731948590

Details

Brand
General
Global Trade Identification Number
Item Form
Liquid
Item Weight
2 Pounds
UPC
714863970218

🌱Optimized for hydroponics & soil

🧪3.78L liquid concentrate

⚖️907g precise dosing weight

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

2624 kr

Duties & taxes included

In stock

Sold byAmazon DenmarkDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Denmark.

Secure transaction

Description

🌿 Master your grow with precision pH power!

BULK SIZE EFFICIENCY - 3.78L volume ensures long-lasting supply for serious growers
PRECISION P H CONTROL - Easily adjust nutrient solutions for optimal plant health
SAFETY FIRST FORMULA - Handle with care for safe, effective pH balancing
TRUSTED BRAND QUALITY - General Hydroponics, a leader with 4.7-star rating from 3,398 users
VERSATILE APPLICATION - Perfect for soil, hydroponics, and organic growing systems

General Hydroponics GH pH Down Paper Down is a 3.78L liquid pH reducer designed for precise adjustment of nutrient solutions in soil, hydroponic, and organic cultivation. Trusted by thousands with a 4.7-star rating, it offers a bulk supply for professional growers seeking optimal plant health and yield.

Specifications

ASIN	B000FG0F9U
Amazon Bestseller	#114,028 in DIY, Tools & Garden ( See Top 100 in DIY, Tools & Garden ) #683 in Garden Fertilizers
Brand Name	General Hydroponics
Customer Reviews	4.7 4.7 out of 5 stars (3,414)
Global Trade Identification Number	00793094015332
Item Form	Liquid
Item Weight	2 Pounds
Manufacturer Part Number	HGC722125
Model Number	HGC722125
UPC	714863970218 793094015332
Unit Count	3780.0 Milliliters

Reviews

H**S

Great value for the money

26.03.2026

P**T

Worked amazing for all my plants!

17.02.2026

A**E

Always the best!

16.04.2026

A**S

Sent as a gift, and they were appreciated

23.03.2026

C**.

good

21.03.2026

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.