How often should I top up the water in my Incubator?

In manual control incubators, there is no written rule on how often you need to top up the water in the incubator because this can vary. Filling the water trough could last 5 days or need topping up after only a single day. It all depends on the environment and the humidity level that  you're trying to achieve.

If the ambient humidity is quite low (if the air of the room is quite dry), the incubator may use more water as the ambient humidity will be lower; whereas if the air in the room feels damp or humid then the ambient humidity will already be quite high, the incubator may use less water. It should be mentioned at this point, however, that a high ambient humidity can also result in the incubator's humidity level being too high. This is why you must always ensure that your incubator is in a suitable environment

Add more water as and when needed - either when it's running low or is empty. Remember it is the surface area of water which increases the humidity. More surface area = more humidity. The depth of the water makes no difference to the humidity level if the water trough is not full to the brim with water.

Please follow the instructions as to whether you need to half fill the trough,or fill it from the start till 3 days before you are due to hatch and then ensure both halves of the trough or both water troughs have water in them and just keep them topped up throughout the final 3 days.

Normally, you are going to be looking at topping-up the water every few days, but less is more. The trough does not need to be full, adding water every day to ensure the trough is full can cause it to overflow resulting in the humidity going to high.

If the incubator has a humidity display you may see the reading, go up and down which is normal. Humidity is relative and it is perfectly fine to see peaks and troughs in your humidity readings