I have an ichlor 30 SWG that has to be over 7 years old. This past season I had to run it at a higher percentage (70%) to keep my levels good. I want to buy a new cell to have as a replacement/spare, should I stay with the ichlor 30 or go with the ic40 cell?? Cost of the ic40 is almost twice of the ichlor 30 and I will need to make minor piping modifications to fit the ic40. With this in mind, should I just stick with the ichlor 30 or upgrade to the ic40 cell?