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Around 18 kilograms. Cooking oil is a little lighter than water, at roughly 0.92kg a litre, but twenty litres of anything is a two-handed lift. Decide where it is going before it arrives rather than after.

At the current price of $68.00, that is $3.40 a litre — the equivalent of 20 one-litre bottles. Prices move, so check it against the product page.

Sealed, cool, dark and away from the stove. Light, heat and air are what turn oil rancid, so the drum belongs on a pantry floor or in a cupboard rather than beside the hob. Keep a small working bottle near the cooker and refill it from the drum.

Either fit a drum tap if the container accepts one, or decant the first few litres into a jug or squeeze bottle while the drum is still light enough to handle, and work from that. Pouring from a full drum one-handed is how it ends up on the floor.

Yes, several times, if it is looked after. Strain it through a fine sieve or muslin while it is still warm to get the crumbs out — food debris is what breaks oil down fastest — then cool it completely and store it sealed and in the dark. Keep oils with strong flavours separate from each other.

When it has darkened considerably, smells sharp or off, foams on the surface, has gone thick and syrupy, or begins smoking at a noticeably lower temperature than it used to. Any one of those is enough. Past that point it makes the food taste of it.

It is the temperature at which an oil starts to break down visibly and smoke. Refining removes the particles and free fatty acids that burn first, which is why refined oils are the usual choice for high-heat frying and unrefined ones are not. Where the packaging states a smoke point, use that figure — it varies with the refining process.

Never put water on it — water flashes to steam instantly and throws burning oil out of the pan. If it is safe to reach, turn the heat off. Smother the pan by sliding a metal lid or a baking tray over it and leave it covered to cool. Do not try to carry the pan outside. If you are not sure you can deal with it, get everyone out, close the door behind you and call 111.

Not down the sink or any drain — it solidifies in the pipes and causes blockages in household plumbing and in the wastewater network. For household amounts, let it cool completely, seal it in a container and put it in the general rubbish. For the volumes a twenty-litre drum implies, a used-cooking-oil collection service is the sensible route; check what your local council recommends.

Orders are dispatched by the store the next business day and typically arrive within 1 to 3 business days by courier. This is a heavy item, so contact the store first if access at your address is difficult.

Free delivery applies on orders above $69 — the delivery fee is confirmed at checkout. There is no minimum order value.

Do not lift it. Photograph it where it sits and contact the store the same day. Returns are handled by the store that sold the item, and nothing in a store's policy limits your rights under the Consumer Guarantees Act 1993.