HJS sees itself as a service partner and would really like to extend its services to you. If you have any questions or queries about anything remotely related to the retrofitting of particulate filters, your best option is to use our Online Enquiry Form. Simply fill it in, send it off and we'll get back to you in next to no time. We also have a strong international presence through our partners. Take a look at our list of partners, where you'll also find the contact data you are looking for.