Very very few fruit juices you buy in supermarkets are truly suited for making ciders. Almost all of them (except for a select few, which are expensive) are all filtered, pasteurized, clarified and have some sort of preservative in them, even if it says "100% juice". If you want to make a good cider, buy a kit or even better, look for an orchard close to you and ask them if they'll sell you fresh pressed juice. That's the kind of apple juices that aren't shiny and golden in the glass like liquid amber, but more of a funky yellowish-creamy colour. I haven't found places selling those for reasonable prices and in reasonable volumes close to Pretoria yet, as I'd LOVE to give a proper cider or wine a shot.