Cmcq, first let me say congrats on comming here to keep money grubbing pool guys (like myself ) out of your wallet!
I have very limited experience with your type of valve (it's not a multiport in the sense I was describing, I've always heard of them as 'push/pull' valves), however the process should still work - the idea is to run the water flow backwards through the filter to 'kick the crud off the grids' and out onto the lawn. I can't quite picture your set-up, but yes, before the final 'backwash' turn whichever valves you need to back to 'normal' filtering for ~ a minute.
You might want to consider starting your own thread on this topic as there are probably others here with more experience than I for your type valve and they may be able to give you better advice. However you handle it, know that I'll always make myself available to help you - Waste