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.

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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

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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

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

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