I don't do my own poppadoms as they are so cheap to buy at Lidl and Aldi.
I know this isn't strrictly on topic, but, I have a 3-litre deep fryer that I use for chips and other European-style food. I fry pakora etc. in a large wok and always strain and drain the oil off after use, storing it it's own container.
Coincidentally, I was just pondering to myself yesterday how long it was wise to keep the pakora oil until it should be chucked and replaced.