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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General Hydroponics pH Down Liquid Premium Buffering For pH Stability, 1-Gallon

General Hydroponics pH Down Liquid Premium Buffering For pH Stability, 1-Gallon

Product ID: 5510609

Details

Brand
General
Item Form
Liquid
Item Weight
2 Pounds
Product Benefits
Lowers pH
UPC
714863970218

📉Precise pH lowering

⚗️Food-grade phosphoric acid

🛡️Long-term pH stability

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HK$619

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Details

Brand
General
Item Form
Liquid
Item Weight
2 Pounds

Description

🧪 Master your grow with the ultimate pH balancing elixir!

FOOD GRADE SAFETY - Formulated with premium phosphoric acid, safe for hydroponic use.
PRECISION P H CONTROL - Easily adjust nutrient solution acidity for optimal plant absorption.
EFFORTLESS APPLICATION - Just a few drops transform your system’s pH balance with ease.
SUSTAINED PLANT VITALITY - Maintains stable pH levels to promote consistent, healthy growth.
TRUSTED HYDROPONIC ESSENTIAL - Top-ranked and highly rated by thousands of dedicated growers.

General Hydroponics pH Down is a premium liquid buffer formulated with food-grade phosphoric acid designed to precisely lower and stabilize pH levels in hydroponic nutrient solutions. Trusted by over 10,000 growers and ranked #1 in hydroponic pH control, this 1-gallon solution ensures optimal nutrient uptake and sustained plant health for professional and hobbyist growers alike.

Specifications

ASIN	B000FG0F9U
Best Sellers Rank	#1,286 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1 in Hydroponic pH Control
Brand	General Hydroponics
Brand Name	General Hydroponics
Customer Reviews	4.8 out of 5 stars 10,831 Reviews
Global Trade Identification Number	00793094015332
Included Components	only product
Item Form	Liquid
Item Type Name	Premium Buffering For Stability
Item Weight	2 Pounds
Manufacturer	Hawthorne Hydroponics, LLC
Manufacturer Part Number	HGC722125
Model Number	HGC722125
Number of Items	1
Product Benefits	Lowers pH
UPC	714863970218 793094015332
Unit Count	1.0 Count

Reviews

S**N

2.04.2024

R**R

21.03.2026

S**D

3.03.2026

H**S

26.03.2026

N**T

23.04.2026

A**R

10.05.2024

P**S

8.03.2026

P**T

17.02.2026

T**E

24.06.2022

竹**亮

11.04.2026

S**I

14.06.2025

J**Y

22.02.2026

K**A

25.06.2024

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