What concentration of fertilizer for daily watering of mounted orchids?

[plantzzzzz]

Some people, like Fred Clarke for instance, fertilize with every watering and do a monthly flush of pure water.

This both makes sense as it matches what happens in nature, and it's nice to not have to remember a fertilizing schedule.

I think he recommends like 1/4 tsp/gallon of MSU or around there for potted plants, but what about for mounted plants which get watered everyday?