i think if you pour them carefully into the keg and purge you aren't going to harm the cider too bad. i am an advocate of trying your best not to aerate after fermentation, i rack once carefully, top up religiously, and bottle or keg with minimal air contact, but there are many people who carelessly rack multiple times, mix around in a bottling bucket, (i certainly did these things as a beginner cidermaker...) and still come out with perfectly good cider, not vinegar or cardboard. and remember under-carbed cider is still CO2 saturated so the CO2 released will help to protect the cider. my opinion anyways. if you do open the bottles and add sugar, dissolve the sugar in something first or you will have volcanoes, that i guarantee.
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