TWO MONTHS LATER: A green filter is broken, although using my PETRA frequently and especially being very careful to cut all that I spend in it very finely, I see myself embarrassed by the failure of the green filter.
I ordered on the site of Petra, I'll see if the exchange is fast, in any case the price of the filter is correct (6) on the manufacturer's website. If there's nothing else to change by the time the price difference with the flagship models of these products is done, I still have time to change a few. To keep in stock so.