PARIJATA 9 inch Copper Water Filter Cartridge: Enhance Your RO Purifier for Healthier, Mineral-Rich Drinking Water

I thought that the center part was filled with copper pellets. However, that was not the case. It's just one layer covering sponge like material, as shown in my pictures.The output TDS is 22-25 ppm and pH is 7.5-8.These numbers make it a decent quality cartridge. Better than the existing cartridge in my Havells Max alkaline, whose TDS is 15-25 but pH 9.5 which is very high with not enough minerals to go with it.For me, an ideal pH TDS combination would be 7.5 pH with 100 ppm.