How much to use in a half gallon

It depends on what you are using it for. If you are diluting it to 3% then I dilute the 12% to 6% with an equal amount of water, and then dilute the 6% with an equal amount of water to get 3%. OR --- 4 oz of water to 4 oz of 12 % peroxide is 8 oz of 6% peroxide; 8 oz of 6% peroxide mixed with 8 oz of water is 16 oz of 3% peroxide. Most household uses don't call for more than 3% peroxide, but you can figure out what percentage you want and mix it with water accordingly. I keep a "whitening bucket" filled with water, some detergent, about 4oz of 12% peroxide in which I toss my white laundry items - wash cloths, dish towels, socks, bras, handkerchiefs, undershirts, T-shirts, and so on. Anything that needs whitening goes into the bucket and the entire bucket goes into the washing machine.

I want to brighten the surface of a bathtub that has a non-slip coating in areas, which has discolored, will this help?

It works like a bleach. I would mix it half the hydrogen peroxide and half with water. Try a small area and see how it works. Mix only a small amount for the first time.

Can you use this to pour down your drains in the bathroom and kitchen to kill drain gnats?

I don’t know but I have pored it down my drains

No, but the oder is not strong.

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12 Concentrated Food Grade Hydrogen Peroxide, for Kitchen, Bath, Laundry, Home and Garden, 128oz

Product ID: 630383156

Details

Brand
HARRIS
Item form
Liquid
Material features
concentrated
Scent
Lemon
Specific uses for product
Grout

💪12% concentration, 4X stronger

🧴128oz bulk with easy-fill funnel

🍽️Food grade, safe for kitchen use

€ 226.85

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Description

✨ Elevate your clean game with 4X power and zero compromises! 💧

BULK READY - Generous 128oz size with an easy-fill funnel lets you mix up to 4 gallons of ready-to-use solution—clean smarter, not harder.
VERSATILE WONDER - From grout whitening to laundry brightening, one bottle tackles countless household cleaning challenges.
KITCHEN SAFE PURITY - Food grade and additive-free, perfect for disinfecting cutting boards and countertops without harsh chemicals.
POWERHOUSE CLEANSER - 12% extra strength formula delivers 4X the stain-fighting power of standard peroxide.
ECO FRIENDLY EFFECTIVE - No fragrances or stabilizers, just pure hydrogen peroxide that’s safe for your home and the environment.

HARRIS 12% Concentrated Food Grade Hydrogen Peroxide is a potent, additive-free cleaning powerhouse designed for kitchen, bath, laundry, and garden use. With 4 times the strength of standard peroxide and a large 128oz supply, it safely disinfects food prep areas and tackles tough stains, grout, and more—making it the ultimate multi-surface solution for the modern home.

Specifications

ASIN	B0BL8C5P7G
ASIN	B0BL8C5P7G
Best Sellers Rank	#58,541 in Health ( See Top 100 in Health ) #514 in Liquid Laundry Detergent
Brand Name	HARRIS
Capacity	128 Fluid ounces
Cleaning Agent Formulation	Stain Remover
Contains Liquid Contents?	Yes
Customer Reviews	4.7 4.7 out of 5 stars (2,542)
Customer reviews	4.7 4.7 out of 5 stars (2,542)
Global Trade Identification Number	00072725014143
Item Form	Liquid
Item Volume	128 Fluid Ounces
Item model number	GL61B0750489
Manufacturer	Harris
Manufacturer	Harris
Material Features	concentrated
Material Type Free	Bleach Free
Model Number	GL61B0750489
Number of Items	1
Package Dimensions	30.48 x 21.59 x 14.73 cm; 4.1 kg
Package Size Name	Gallon
Part Number	GL61B0750489
Product Benefits	Concentrated
Recommended Uses For Product	Fizzing action powerfully penetrates & lifts tough stains for an oxygen-powered, whole-home clean. Not for pesticidal use.
Scent	Lemon
Size	13.79 l (Pack of 1)
Special Features	Concentrated
Special Ingredients	Hydrogen Peroxide
Specific Uses For Product	Grout
Surface Recommendation	Marble
UPC	072725014143
Unit Count	3785.0 Milliliters

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€ 226.85

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered 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 Croatia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Sneha T.

Received my product in pristine condition. Great service overall.

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