Nutrapet Designed in the United States of America now launches its line of Silica Gel Cat litter. Available in three sizes, 3.8 L, 7.6L and 16L.This product comes with superior absorption, advanced odor control, convenient and easy to use, less tracking and lastly environmental friendly.ADVANTAGES OF CRYSTALS CAT LITTER-no clumping action- more eco briendly because it naturally bio-degradable- this litter tends to be a bit tidier with less mess- when it comes to fighting odor, crystals cat litter does a good job absorbing the odor and masking the undesirable odor of cat urine- unlike many litters, you only to to completely replace this litter approximately once every month- if you have allergies or just want less dust in the house, you will like crystals cat litter- the manufacturer even says you can flush the litter down your toilet- at a time when it seems like everything around us is toxic to our health, crystals are said to be non-toxic.