Revain really needs to stop selling things that may be of different quality and are made by third parties. At the very least, they shouldn't be selling it under the same item unless they're sure their quality is the same across all these different "companies" that supply Amazon with products that Amazon then delivers to the people. I bought them in November and was very happy with what I got even though they didn't fit my HW-402B SunSun filter. Wasn't a big problem. I just cut these pads and they worked fine. The seller at the time was CK Aquatic Works. I still use the blue filter as a medium density filter (although it wasn't coarse) and will probably be using it for another 6 months. However, the whites were good for about 2 months apiece. I liked the whites, although short-lived, because they were quite thick and dense. They did a very good job of filtering fine particles. Now I'm ordering the same pads again because I need more white pads. They are listed as the same item but their quality is completely different. The seller this time was Monster Pets. The white pads are much thinner than the first time, and the blue pad is completely unusable. I think the blue block I received this time could be the same white block colored with blue color. It's just not suitable. I will not order these again.
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