I have a Circupool SI-45, that's on its 8th season. Still seems to be going strong, but am considering purchasing another cell to have on hand when that one gives out. One of the big buying points was that it was that it used a T-15 cell. My assumption was that anything T-15 could be used as a replacement, but want to ask you all if that is correct. Do I need to / should I stick with an "authentic" circupool replacement cell, or is any manufacturers T-15 compatible? (If it makes any difference, the software version reports "r 624")