Elaine, when I first started asking questions here about my Phals if you remember how much white coating was on the leaves? That's because I was misting with tap water. Our tap water has a pH lever of 7.8 -> 8.3 which I was told somewhere on here that it's too high for orchids and that I should use distilled water which is what I've been doing. They only get a light misting twice a day with the potassium nitrate which is mixed 1/2tsp to 1gal of distilled water. They're getting fed/watered every 8 or 9 days with Better-Gro food 1/2tsp per gal of distilled water. Every 4th time they get just water poured through to rinse them out.
