The first think I though was what panjianlien says, that your water might be salty and/or alkaline. if the beans around you have been sitting on the shelf for a while, it can take a long time to get those suckers cooked. Maybe being in the desert makes this happen sooner? a few pots of beans ago, I randomly had a bag of beans that took something like 6-7 hours to cook after 2 days of soaking, in my Philly not so salty or alkaline water. now I cook them the day before I think I'm going to eat them.
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if the beans around you have been sitting on the shelf for a while, it can take a long time to get those suckers cooked. Maybe being in the desert makes this happen sooner? a few pots of beans ago, I randomly had a bag of beans that took something like 6-7 hours to cook after 2 days of soaking, in my Philly not so salty or alkaline water. now I cook them the day before I think I'm going to eat them.