I use my freeze dryer 24/7. As soon as I take the food out, I open the oil to drain it and turn defrost on. When I come back 15 minutes later, I refill the oil and finish defrosting with a hair dryer. Within 30 minutes of one batch ending, another has started. The pump holds about 3 cups of oil and I have a gallon that I keep filtering and using. That way I have time to let oil settle and then work it's way through the filter. I takes about half a day for the oil to filter. Keeping a gallon in use means I am never rushed. always oil in the jug ready for use, oil settling in the catch pail and oil working through the filter.
I don't know if you have access to Amazon, but that's where I get my sawyer filters. They are about $18 each. I have a spare one so if and when my original one clogs, I can just switch them out.
I'll try to post here more often. Freeze drying has become such a passion. I no longer cook for two......I cook for 10 or more and freeze dry all the leftovers. I FD raw eggs when my hens lay faster than I can use them and I am gearing up to have a very large garden this year and will be freeze drying so much of what comes out of it. I have reduced my dependency on my chest freezers so much in just a few months it amazed me. I have FD pork, chicken, beef (all home grown) and wild venison. I am starting to open jars of home canned meat and FD it because I know it will keep longer. It's just amazing what these machines can do!