Hey Jimmy.
It makes different versions of the original so you actually get all the usual image sizes, including the original and then all of these new versions too.
For your use-case, this plugin will do exactly what you need. Upload 1 image, the plugin will spit out the chosen versions (blurred in your case) and then you can use it in the loop like so:
<?php $image = wp_get_attachment_image_src(get_field('image'), 'image-effects-1000-blurred'); ?>
<img src="<?php echo $image[0]; ?>"/>
This will spit out a 1000px wide blurred version of your image. To get an 800px wide or 400px wide just change – image-effects-1000-blurred to image-effects-800-blurred or image-effects-400-blurred.
Hope this helped. Kinda hard to explain without making a sentence too long. Thanks.
This is great, thank you so much for your advice.