Clogged filters

I have been running vehicles on wvo for three years and using the same filtering set up for two years. I have used the same filters on my vehicles for three years. The filters on my current wvo burner are getting clogged after only 15-20 gallons used. I don't have a clue what is going on. Any advice?
Thanks,
Diesel Donkey

Reply to this post

Image CAPTCHA
Enter the characters shown in the image.