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

Product ID: 620202427

Details

Brand
HARRIS
Item form
Liquid
Item volume
128 Fluid
Material Type Free
Bleach Free
Material feature
Unscented
Scent
Lemon

⚡4x stronger stain power

🏠multi-surface versatility

🧼bleach-free oxygen clean

AR$488347

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Description

✨ Elevate your clean game with oxygen-powered brilliance! 🧽

OXYGEN POWERED CLEAN - Fizzing action lifts deep-set stains without harsh chlorine bleach.
SAFE TRUSTED FORMULA - Effective yet safe for people and pets when used as directed.
ALL IN ONE HOME SOLUTION - Replace multiple cleaners—laundry, grout, upholstery & more with one bottle.
POWERFUL 4 X CONCENTRATION - Cut through grease, grime & stubborn stains with unmatched strength.
GENEROUS 128 OZ GALLON SIZE - Bulk capacity for long-lasting, cost-effective cleaning power.

HARRIS 12 Concentrated Food Grade Hydrogen Peroxide is a bleach-free, highly concentrated 128oz cleaning powerhouse that uses oxygen fizz to penetrate and lift tough stains across multiple surfaces. Four times stronger than standard peroxide, it’s perfect for laundry, kitchen, bath, upholstery, and outdoor cleaning, offering a versatile, safe, and eco-friendly alternative to harsh chemical cleaners.

Specifications

ASIN	B0BL8C5P7G
ASIN	B0BL8C5P7G
Benefits	Concentrated
Best Sellers Rank	401,989 in Grocery ( See Top 100 in Grocery ) 2,084 in Liquid 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 (2,510)
Customer reviews	4.7 4.7 out of 5 stars (2,510)
Delivery information	We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout.
Global Trade Identification Number	00072725014143
Guaranteed software updates until	unknown
Item Form	Liquid
Item Volume	128 Fluid Ounces
Item model number	GL61B0750489
Manufacturer	Harris
Manufacturer	Harris
Material Features	Unscented
Material Type Free	Bleach Free
Model Number	GL61B0750489
Number of Items	1
Package Dimensions	30.48 x 15.24 x 15.24 cm; 4.09 kg
Package Size Name	Gallon
Part Number	GL61B0750489
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	3.79 l (Pack of 1)
Special Features	Concentrated
Special Ingredients	Hydrogen Peroxide
Specific Uses For Product	All Purpose, Bathroom and Kitchen Surfaces, Fabric, Carpet and Upholstery, Floor, Grout, Tile
Surface Recommendation	Fabric, Carpet, Glass, Tile, Grout, Flooring, Kitchen and Bathroom Surfaces
UPC	072725014143
Unit Count	3785.0 millilitre

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AR$488347

Duties & taxes included

In stock

Sold byAmazon ArgentinaDelivered 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 Argentina.

Secure transaction

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