I see, alright then I will stay away from using the ADC2 pins for this project.
Yeah, the ESP32 ADC is fairly linear around there, but it seems like it cannot differentiate between 0V and 0.1V as well as 3.2V and 3.3V as mentioned in the website you sent. I am not sure if my sensors will ever reach those levels but I will stick to the ADS1115 for now.
I will try to use the voltage divider on the Turbidity sensor output, but I will have to come up with a new equation to convert the voltage values into turbidity standard unit like NTU. Someone did come up with a new equation (Getting NTU from Turbidity Sensor on 3.3v - #14 by zachary_fields - Science and Measurement - Arduino Forum) but it does not work well for my case welp.
Thanks for the info