How to choose reverse osmosis and connect it to the apartment’s water supply system?

Hello. Please help me pick up the equipment. In my apartment there is a main filter “Aquafor Viking” (B-150) and “Aquafor Favorite” for drinking water (B-150 ECO). I also want to include reverse osmosis in the system to use this water for my humidifiers, as from ordinary filtered water, over time, scum and mucus appear in the humidifiers, etc.

Tell me, is it possible to supplement the already existing system with reverse osmosis and what is the best way to buy it? I will need 25 liters per day for humidifiers. Thank.