What is the use of the infrared filter of ordinary SLR cameras?

If you use an infrared filter, you can't get the effect of infrared photography anyway!

Because the image sensor is equipped with a low-pass filter, infrared light is prevented from entering.

Infrared photography can be achieved by removing the low-pass filter in front of the photosensitive chip, but it is easier to remove it than to put it back.

Infrared filter is to filter visible light and let infrared light pass through, but the amount of infrared light is not as good as visible light, so the exposure time is very long.