Product review (1 stars): you will hear the crystals bouncing inside and look like half filled
The weight is much lighter than the Genuine Aqua-Pure C-CYST-FF and when this Swift Green filter is shaken, you will hear the crystals bouncing inside and look like half filled. The genuine one is very heavy and solid as a rock, you will not observed any thing loosing attached inside the filter.

This filter I am serious doubt its filter ability and their authority verification claim. No use by date printed and only have a loose plastic bag sealed the item. I am prepared to return.