There are two versions of Persil products available---the Henckels version (from Germany) and the Unilever version (from the U.K.). You can order the Henckels version quite easily in the US, and it's an excellent detergent.
Having used both (the "bio" powder variety in each case), I prefer the Unilever version, as it cleans stains a bit better and rinses cleaner than the German version. However....it costs about $47 per 51-use box (I stretch it to about 80-90 uses and still get fantastic stain-removal) once you include the steep shipping price. I usually order three boxes at a time from the Britsuperstore online.
I don't want to slight the Henckels Persil----if you liked the Persil you tried, I'm sure you'd like the German version. It's an excellent detergent and far less spendy than UK Persil.