Spoiler, its RDT
In case people do nto know what RDT is, which they really should if they have been into coffee for a little while as it makes a big difference:
RDT is Ross Droplet Technique, which is very much adding water to beans. Named after David Ross who came up with it back in 2005
If it applies to both I would still post it here as the community is bigger and would still benefit from it. Even for basic stuff as there appears to be far more total beginners than the subreddits in the other place.