1 Buy = 2 Pondmaster Carbon & Coarse Poly Pad Replacement Filters! The Carbon & Polyester Pondmaster Filter combo pack is a complete replacement set that provides mechanical, biological, and chemical filtration. It also resists compacting. All Pondmaster 1000/2000 series filters are compatible, and it can be used as a replacement for other Pondmaster Kits as well (found below). The Carbon & Polyester Pondmaster Filter combo pack can be rinsed & reused as well. Pondmaster products have been designed and manufactured to meet the demanding requirements of pond hobbyists and professionals everywhere. Fish friendly, environmentally sound and energy efficient. VMInnovations is an authorized Pondmaster dealer!