We have added a short survey to our website. When you get your invoice, there is a link to let us know how we did. If you complete the survey, we will send you a $5 off coupon to use on your next check out. We sincerely appreciate the time you take to provide us your feedback. Also, you can sign up for filter service and reminders. We can provide you with a case of high quality pleated filters and remind you when to change them through email notifications.