I have a hot tub that needs a new filter. unfortunately I cannot find the owners manual nor can I accuire the information from a Hot Spring dealer (suspecting they want me to buy from them). I need a replacement filter for this and dont wanna spend $80 dollars for one, I know there is an alternate knock off brand or unerversal type out there... there's gotta be! Manufacturer: Hot Spring Spa Type: Classic (1988) Serial #: F-15733
Plz HELP! LOL!