Am I crazy or are Rena filters POS? I bought an XP4 and had to replace it within a month, and now two months later a different one died. Did I just get two bad apples, or are Rena filters just that bad? I read good review, but experience has been dreadful. The intake has plenty of room, and the spray bar had good pressure coming from it, but two have died on me in 3 months.