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.

General Hydroponics Ph Down Liquid Premium Buffering For Stability 1

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Description

🌿 Master your grow with precision pH control!

GENEROUS VOLUME - A full 1-gallon supply means fewer refills and uninterrupted growing cycles.
FOOD GRADE SAFETY - Formulated with premium phosphoric acid, ensuring safe and reliable use in hydroponics.
PRECISION P H TUNING - Easily adjust nutrient pH to the ideal 5.5-6.5 range for optimal plant health.
CONSISTENT STABILITY - Promotes long-lasting pH buffering to keep your nutrient solution balanced and thriving.
TRUSTED BY THOUSANDS - Backed by 3,395+ reviews and a 4.7-star rating—join the hydroponic pros who rely on it.

General Hydroponics pH Down Liquid is a premium, food-grade phosphoric acid solution designed to lower and stabilize nutrient pH levels between 5.5 and 6.5. Packaged in a convenient 1-gallon liquid form, it ensures consistent buffering for hydroponic systems, trusted by thousands of growers worldwide for reliability and value.

Specifications

ASIN	B000FG0F9U
Brand	General Hydroponics
Brand Name	General Hydroponics
Customer Reviews	4.7 out of 5 stars 3,434 Reviews
Global Trade Identification Number	00793094015332
Item Form	Liquid
Item Type Name	Premium Buffering For Stability
Item Weight	2 Pounds
Item form	Liquid
Item weight	2 Pounds
Manufacturer	Hawthorne Hydroponics, LLC
Manufacturer Part Number	HGC722125
Model Number	HGC722125
Number of Items	1
UPC	714863970218 793094015332
Unit Count	3785.41 Milliliters

Reviews

R**O

Arrived no leaks 🙏

Works great arrived on time no leaking

3.06.2026

A**R

Returning customer forever

For me this is my holy grail pH down and I will never need another. Others I have used in the past are more pricey and are either the same or less effective. This will always be my favorite, I am happy to have found it available here!

8.06.2026

J**S

PH Down👇

Super fast shipping with top notch products

4.06.2026

A**E

Great

Always the best!

16.04.2026

H**S

good value

Great value for the money

26.03.2026

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