There all about the same, use whatever you can find locally or

https://www.amazon.com/Nu-Calgon-4296-60-Pan-Treat-Scum-Tablets/dp/B003N5AS60

That float switch needs to get fixed ASAP before you water damage your house. I would give the pan tablets another try, you can buy these. They have to go in the drain pan (behind an access panel) FYI. Proper filtration is also important for eliminating pan clogs. Make sure you are using a MERV 8 or higher filter and changing it monthly.