Pet Water Fountain Filter 12 Pack Replacement Compatible with 135 fl oz/4L

Replacement filters come with 3 layer filtration system. High density cotton canStop hairs and debris; Ion exchange resin can soften the tap water; Activated carbon can remove bad taste and odor. 【Pre-filter Sponges】Sponges can prevent debris from blocking and damaging the pump and extend its working life. 【Warm Tips】Please soak the filter in water for 5 minutes before use and rinse under running water. Which will prevent carbon dust from shedding into water, keep water clean and fresh.