Having a funnel is important for saving the oil. I have a funnel with a strainer. I clean the narrow part of a funnel by making a pipe cleaner with a paper towel. Frying things coated with flour makes the oil dirty. The particles in the oil settle at the bottom of a pan once the oil cools. The particles will not enter the funnel if someone pours the oil carefully. I put the used oil in a plastic milk container. Ball makes large glass jars. I put the container of oil in the refrigerator. At room temperature, used oil smells offensively after a short period of time. I believe that the oil spoils. Unless the smell or color of the oil is offensive, I use the oil about 4 times.