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With a state of the art two-chamber filter design, the Little Sister 2000 has set the industry standards for over a decade. Cleaning the Little Sister is easy and quick. Our revolutionary drain design reduces cleaning to just minutes with the opening of a valve.

Features include:

  • Durable construction (virtually indestructible)
  • Full lid to inhibit unwanted algae and debris in the filter
  • Spray bar to diffuse oxygen and distribute flow through the media
  • Two 1 1/2" drains for easy maintenance (valves included)
  • Dense filter brushes to trap debris
  • Durable, easy-to-clean filter matting for biological support
  • 3/4" ID hose inlet, 1 1/2" FIPT discharge
  • Maximum flow rate 800 - 1,000 gallons per hour. Recommended for ponds up to 2,000 gallons (koi ponds 1,000 gallons).
  • Lifetime warranty.

Overall dimentions: 33" L x 19 1/2" W x 18" H. Ships Oversize 1 UPS/FEDEX.

Item # Description Ship Weight Price
7786800112 Little Sister 2000 Filter 36 lbs. $359.00
7786800213 Little Sister Replacement Media - Pre-filter (2 pcs) 2 lbs. $29.89
7786800212 Little Sister Replacement Media - Bio-filter (3 pcs) 3 lbs. $29.89


A larger version of our popular Little Sister 2000, the Big Sister 3500 is specially designed for mid-sized koi ponds. The Big Sister 3500's modern two-chamber design boost efficiency while reducing overall maintenance. Cleaning the Big Sister is easy and quick. Our revolutionary drain design reduces cleaning to just minutes with the opening of a valve.

Features include:

  • Durable construction (virtually indestructible fiberglass)
  • Full lid to inhibit unwanted algae and debris in the filter
  • Spray bar to diffuse oxygen and distribute flow through the media
  • Two 1 1/2" drains for easy maintenance (valves included)
  • Dense filter brushes to trap debris
  • Durable, easy-to-clean filter matting for biological support
  • 1" SLIP inlet, 3" SLIP discharge
  • Maximum flow rate 3,000 gallons per hour. Recommended for koi ponds up to 3,500 gallons (goldfish ponds up to 5,000 gallons).
  • Lifetime warranty.

Overall dimentions: 46 1/2" L x 29 1/2" W x 22" H. Ships motor freight.

Item # Description Ship Weight Price
7786800116 Big Sister 3500 Filter 85 lbs. (motor freight) $859.00
7786800214 Big Sister Replacement Media, Bio-Filter (2 pcs) 30 lbs. $57.89