So my daughter wanted to use the spa the other day, and the heater (Jandy LT400) wouldn't ignite. I've read and researched here and elsewhere and one of the first things most recommended was to ensure all the filters (Jandy CL460) were clean. I should add that I cleaned the cartridges in November, though we've had some big storms lately. So I cleaned them all again, and still no ignition. That is likely a separate thread, but my question is this:
My cartridges are about 13 years old and appear to be in great shape, but should I replace them now?
My pressure is not super high, but one source I researched suggested that even if they look OK they may not be. I don't know if TSP is available here in California (I doubt it), so what are my options? Clean with dishwasher soap, TSP, or replace?