*Product May Be Subject To Extended Lead Times. The UltraZap 3 Bag Fibreglass Sand Filter is suitable for koi ponds up to 12,000 liters. It features a durable woven fibreglass body and a top-mounted lid for easy backwashing. This mechanical filter efficiently removes solids, ensuring optimal water conditions for your pond. Note: Koi filter sand is not included and must be sourced separately.