The page doesn't technically say that candles don't require scrubbing. Candles also require scrubbing. But the disadvantage is omitted from candles, while expli

The page doesn't technically say that candles don't require scrubbing. Candles also require scrubbing. But the disadvantage is omitted from candles, while explicitly presented for cylinders: "Oxygen cylinders are used in the event compressed air fails and generally require the support of a scrubbing system to remove carbon dioxide [...]" Oxygen cylinders are also used as an emergency non-consumer product. The comparison is a misleading one.