If you only have chips occasionally, as I do, a deep fat fryer is hardly a 'must have'. The oil sitting in it will oxidise and eventually go off. I use a small saucepan to deep fry oven chips in batches of a half-dozen at a time, and keep them warm in the oven. They taste far, far better than just heating them in the oven. Once the oil has cooled, I save it by returning it to the bottle, using a Melitta conical coffee filter paper and a plastic funnel. This filters out any bits in the oil, and also takes out any flavours left in the oil.