Mary - It's possible to culture them to your sump, however they might get pushed out depending on how high the flow rate is. They can be added directly from the cold bottles to your sump, however I'd suggest letting them warm up to room temperature first.
By far the most successful way to culture them is in a simulated tide-pool, and a 9x13 glass cake pan works perfectly for that. It will be about 30 days until you see results, but after that you can scoop them out regularly.
Hope this helps
