First of all I'd like to thank all the posters that have contributed their time and knowledge here. Long time reader, but first time poster. Using PoolMath, which is the appropriate setup setting to use for my standalone fiberglass spa? I should mention it has a SWG that I believe to be defective so I've been using tricolor tabs for sometime as the sanitization source. Do I just use the TFP fiberglass pool setup and set the gallons to 450 or should I use the traditional spa setup?