Is it possible to bypass the in-floor cleaning system with a Polaris cleaning system?

Yes it is possible to bypass an In-Floor Cleaning System. My first question would be, why would you want to? In-Floor Cleaning Systems are much more efficient than any portable cleaner. If you are having problems with your pools cleaning performance, I would look into flow adjusting your cleaning heads, before investing into a cleaner. Also It will probably be cheaper to repair the floor system, than to buy a portable cleaner.

The easiest thing to do would be to buy a Polaris Suction Cleaner, such as the ATV. This can be installed via the skimmer fairly easily. If you want a pressure side cleaner, then you would need a dedicated return line. If you have wall returns already plumbed in your pool, You can retro one these lines to feed your Polaris. Polaris sells a return kit allowing you to do this.

Good Luck

INfloor Parts.