Last evening, presented on Debra Wink's pineapple juice starter protocol. So I gave it a try. I mixed 30g of the juice with 20g of organic WW flour and put it away to do it's thing at about 75 degrees. 16 hours later it has more than doubled! Maybe there was some cross fermentation from my other starter or from the container or stirrer. (Both were clean but previously used with my starter.) But it would have been a very tiny amount.
I'll add the same amount of each again without discarding per the protocol. In a couple days I'll stay discarding and transitioning to water and flour.
This is very cool!