I'm fond of white Phals. I had the one in my avatar for 35+ years, I used it in my wedding flowers. I lost it a couple of years back, but now I have another white Phal, much like the one in your post, to replace it. Maybe I will only have one, but I sure like having it! Mine is labelled Phal. Sogo Yukatian, it is a very popular orchid. The picture is from its early bloom, it gets more and more white as it is open longer. Mine is also a rescue, so glad it was labeled! Yours might well be the same one.
I have a white Catt too, but it hasn't bloomed yet. Just waiting, its close.