I keep most of my Phals in clear plastic so I can see what is going on with the roots. I can then check every watering. Once a month I run straight water thru to flush any build up of salts, etc.
I feed mine weakly-weekly or every 10 days at most. I "water" them in old butter containers and give them a good soaking. I also dip them twice. Once in the fert/water solution and a second dip in a mixture of 50 % Superthrive and 50 % root stimulator. There are several brands - one I have good luck with is Rapidstart. Be careful - if you get any water in the crown area soak it up immediately with a paper towel.
I use medium size orchid bark and perlite and sometimes add a bit of coir. When I report, I soak the media for 24 hours in warm water.
Good luck - OBTW. They say you are not a real orchid grower until several have up and died on you.
