Hi Tarev,
First semiwater culture convert was done in mid winter, with full bloom. I bought a few new one is spring and early summer and converted all of them to semi water culture (all with blooms too). Blooms lasted 4-6 months. I know!! I was super happy!!
I used tap water. I'm based in Toronto, Ontario so we have pretty hard water.
At the moment, all my orchids are in full water culture. Each of them are kept in their own glass vase or wine glass. Nothing else in the glass except water and the orchid. Only 1/4 -1/3 of the roots are sub merged in water. I don't aerate the water. I always top up the water so that some of the roots are constantly covered in water. If you are concern with algae growth, just change the water. Some one said algae is good for the roots as it produces oxygen and would benefit the orchid roots. I noticed that the ones that I don't touch at all (as in remove the plant from the glass vase while doing water change) strives better.
Tips: make sure you removed all dead cells or you might get a lot of fungus. Sometimes it is difficult to remove all dead skins or roots, so I just apply listerine on the fungus or mold. I always rinse it off later. Alternatively, I will just submerge the fungus in water and drown/kill it. Seems to work for my phal.
DO NOT let the base of the leaves touch the water.
One final note, some of my orchids initially looses a few roots BUT new water roots grew and appears to strive in water.
Hope this helps.
