mmm this is strange i just done this sort of thing for a freind who is setting up his old 4ft tank
he had 2 x 2213 and said he thought it was best to put carbon in it but i told him things have changed since the last time he had a tank and he needs efimech and substrate pro he also wanted to buy new hoses and pipe work
buy the time we added up the price of what he need he was beter off buying a new pro2 at the extra cost of £45
the eheim classics were good in their day but to tell the truth they are a pain to get closed and primed if i had one i would upgrade asap and run the 2 filters at the same time for 3 weeks then remove the 2215 and put it on ebay