When using the RO system for the first time, the water may seem to have some bubbles in it, which is natural and safe. The reason for this is that as the pump is pushing the water, it is also pressurizing the air. It will shrink the air molecules, increasing the solubility even more. Because of the pressure in the RO system, the air cannot be discharged at that moment.
Whenever you switch on the faucet to obtain water, however, the air pressure is released. As a result, there will be a large number of bubbles in the water. After allowing the water to sit motionless for a bit, all bubbles will have dissipated, and the water will be safe to drink. Worry not, as there isn’t any review that suggested those bubbles are dangerous.