In case you enter a discount code during checkout that doesn't exist or isn't currently active, then you can see the message: “Unable to find a valid discount matching the code entered”.

Yes, you must have a valid Gpfilter account in order to buy an item at the Gpfilter site and use your coupon. During the process of buying an item on our site, you can use your Gpfilter account to see more of our services.

Normally, one discount code is only applied for one offer. However, If the users put a vast of items in their cart, it is easy to use one coupon code to purchase items. It depends on Gpfilter's policy, you can contact Gpfilter via mail for your reference.

There is no certain number for the frequency of releasing coupons from Gpfilter. But, most of the time, there will be at least one available. Special Discount Days such as Black Friday, Cyber Monday, Back to School Sale... come with many coupons.

Let us know via email, our team will confirm with Gpfilter to fix and remove all Promo Codes, Coupon Codes, and Deals that aren't working.