I wonder if that would cause your washer to rust over time? I'm using a dry pail. Hopefully that works fine.
I bought all free and clear "commissary" version with no brighteners added and plan to use that for all of our laundry, including diapers. It works out to about 8 cents per load and so far I like it just fine. I find that any f&C or natural detergent doesn't get stains out like conventional does so I use zout to pretreat stains on our clothes.