What do you mean they are no longer produced.. Seen them sold everywhere stillSalzabar said:I have had magnum 350 canisters since 91' when they came out. I still have 2 of the orignals and one that I bought used from Markster. Yes it has its deficiencies when compared to the newer generations of canisters but all I have ever done to keep them running is change the o-rings. To me that says alot about the quality of marineland products and for that I must advise on anything from Marineland. The Magnum 350 is not produced anymore but the new C-series looks promising.