Welcome to our forum.
To begin, what was the salt system set to (1-10)? What was your usage, how many people and approximately how many times per week? Now, did anyone test for phosphates? If not, probably your issue. High phosphates are a food source for bacteria and algae and have been the primary issue for the customers of mine that have had struggles.As for the foam, the hot tub cannot make foam, something is creating it. Whether that be laundry soap residue on swimsuits, person hygiene products, someone adding something to the hot tub, something.If you are set on bailing on the salt system, the salt power supply needs to be disconnected, replace the salt cartridge with the plug that originally came in the hot tub, drain and start fresh.