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From The Aquarium Wiki

[edit] What is it?

Kleen Off is made by Jeyes Ltd in Norfolk, England. It is a simple ammonia solution in a 500ml plastic bottle.

More usually sold as a powerful cleaner it is ~10-35% Ammonium Hydroxide (NH3), that is ammonia in water.

This product is often sold in small DIY shops throughout the UK and cost around £2.50

You can find in online by searching for "Jeyes Kleen Off Ammonia Multi-Purpose Household Cleaner"

• 5 drops of this liquid into 10L (2.6 US G.) of water will give you ~1ppm TA total ammonia reading.

• Used in the method of fishless cycling of new aquariums.

WARNING THIS LIQUID IS HIGHLY CORROSIVE AND DEADLY TO ALL FORMS Of LIFE

[edit] Links

• Ingredients Jeyes website (Archived link Jun 2007)
• Typical Ammonia hydroxide MSDS sheet