Daily clear water back flushes after using machine (until water runs clear) + "portafilter wiggle".
Then once per week i do detergent back flush using full circle (3g).
The Slayer auto cleaning program seems to be pretty similar to the GS3 AV.
It is 150 seconds total, it runs 5 sec on(so it gets to full pressure for about 1-2 sec), 10 sec off. It does this 10 times. Then screen menu, tells you to remove portafilter and press the button. At which time it runs 15 sec on (rinse).
I usually run the cleaning cycle one with backflush detergent,then again without detergent in portafilter. Not sure this really needs to be run the second time, as the manual just mentions to run it once. Though i want to ensure all soap is out.
Prior to detergent back flushing:
Since i have IMS competition coated screen, prior to doing detergent backflush, i remove it, thouroughly wipe down dispersion block and use Espazzola Grouphead Cleaning Tool. I and put in the stainless screen, then detergent back flush as outline above.
Also once per week i drop basket it hot water and full circle, Then rinse clean.
And use microfilber cloth and hot water to thoroughly clean coated shower screen.