I've gotten many years of experience with the cleaning cartridge and am very satisfied. In particular, this applies to the amount used to (very economical).
This consumer product, the price plays an important role. Since shipping costs accounted for in this case, the purchase was much cheaper than in the so-called specialized trade.
So everything supi everything great, my husband is very satisfied. Just wanted to add that this cleaning cartridge suitable for all Series that I was not as clear, maybe it saves now one or the other time in looking like me :-)