DIY Fat Trap




Introduction: DIY Fat Trap

A free way to dispose of your kitchen fat oils and grease!

Don't block your drains. Make a simple DIY fat trap. Seal-able, no smells.

Simple, easy and free.

Step 1: Collect the Essentials

All you need is one milk bottle - a funnel and tape/scissors may be useful..

Step 2: Pour Your Cooking Oils Into the Bottle

Add your fats and grease into the bottle. Use a funnel if it helps.

Step 3: Wipe Fat From Pans

Use a paper towel to clean fats from pans and put the towel in the bin or the bottle. If it is in the bottle it may help later on when the water and oils separate.

Step 4: Leave to Settle

If you shake the bottle some fats will stick to the bottle.

Keep adding new fats and leave to watch as the oils and water separates.

Step 5: Optional -Drain Any Water

After the fats settle you may have a lot of clear water at the bottom.

Take the bottle outside, use scissors to make a hole and drain off most of the water onto the earth. Make your hole near the bottom and seal it up with tape.

Step 6: Bin the Bottle

Put your bottle in the normal bin. It will be burned along with the fats to produce energy.

There isn't much plastic in the milk bottle so its not that wasteful, better than fat blocking your drains.



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8 Discussions

I really like this idea. I will try it at home


9 months ago

I prefer to use golden milk as it's a lot more reliable and smell proof than normal milk cartons

I usually use thicker containers, like the jugs the arizona tea comes in :) They work pretty well!

2 replies

Thanks for the tip. This is project work for a school team taking part in this year's First Lego League (FLL) competition all about Hydrodynamics. Thanks for looking!

See our other team's work on

This is very very very useful thanks @mjb23

This is just absolutly amazing, I will be using this on a daily basis!

Or reheat the oil just until liquid, and filter through cheesecloth into a sealable container to use later for cooking other things or use in pastries, or making candles or soap.

Nice trick for separating the water though. Score one for the easy way.

Note... Do this when the fat /grade is cool. :)