The sodium sulphite is not chemically as effective in reacting away the thiosulphate, for that the metabisulphite is needed. My understanding is that the sulphite component in hypoclear is there to prevent unnecessary oxidation of metabisulphite, i.e. to extend the shelf life. I am not saying the sulphite does not work, but it certainly is less effective than a combination of sulphite and metabisulphite. Typically rinsing times are reduced from 30 minutes to 5 for paper, and 15 minutes to 2 for film. I use hypoclear, rinse under the tap briefly, and then do two stand rinses of 2-3 minutes each in clean water, after which I just flush the film under running tap water very briefly again and then do a final dunking in distilled water with a drop or two of wetting agent (Agepon). It takes less than 3 liters of water to process two films, if one works sparingly.
Originally Posted by sandermarijn