i have done 6 flushes and in my last flush i have expelled 200 stones of different size as usual pea green and pea size, and after that a lot of foam.
i think this is due to Epsom Salt laxative property. because once everything is clear from our stomach due to Epsom Salt there is nothing to expell out but Epsom Salt is still continuing to do its job so it expell everything including water with other juices of our stomach and nothing all.