Rabbanut Mehadrin Yerushalayim does not allow CSS Petach Tikva, according to a new kashrus alert where they removed a hechsher for using those products.
I suspected this when all the Aromas in Jerusalem switched from Rabbanut Mehadrin to CSS Petach Tikva (this was well before the recent scandal) The Aroma in the airport's Rabbanut Mehadrin was downgraded to Ragil as well.
They still allow Badatz Bet yosef though, which shows the Rabbanut considers them a better hechsher.