Reverse osmosis, plugged drain

[Powerless]

Hello,

My place came with RO system, I had sink drain plugged had to use plunger.

I just thought about this and RO is not air gapped, and most likely water have backed up when plunging as I don’t see any back-flow valve.

I feel like I should replace whole RO - but do I need to replace the faucet ( I have sink faucet with built in RO spout ) - it’s not a cheap faucet



Any suggestions ?

Thank you