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https://www.swelluk.com:443/kockney-koi-mega-box-filter/ 
Kockney Koi Mega Box Filter
Kockney Koi Mega Black Box Filter is designed for ponds up to 13,700L, and can be used with or without a UV steriliser, whichever is best to suit your pond.
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Product Information
These Kockney Koi Box filter's are ideal for goldfish ponds from 5,500L to 13,700L with a maximum flow rate from 2,800 LPH to 6,800 LPH dependant on which model you choose, please see table below. They can come as a bio filter, or the additional UV can be added for clearer, cleaner water to complete your pond. The mechanical and biological filter media ensures the water goes through a thorough clean. The no-fuss design makes installation simple. They have been designed to enable partial burial if required.
Hosetail Inlet fits ½" ¾" 1" 1¼" 1½" and can be reduced to regulate flow rate by trimming the hose tail - Low Cost - Easy to install - High flow rate - Two stage filtration - Integral Overflow. Replacement foams are available here
The Yamitsu UV Steriliser is not included but is recommended for clearer, cleaner water.
| Product | Pond Size | Koi Pond Size | Recommended UV | Max Flow Rate | Recommended Pump | Guarantee | Dimensions |
| Black Box Filter | 5,500 L | 2,800 L | N/A | 2,800 LPH | Filter Pump 2,300 | 1 Year | 45 x 30 x 31cm |
| Mega Box Filter Bio | 7,800 L | 4,550 L | 11w | 4,000 LPH | Filter Pump 3,300 | 1 Year | 45 x 31 x 34cm |
| Mega Box Filter Bio Large | 13,400 L | 7,300 L | 15w | 6,000 LPH | Filter Pump Premium 5,000 | 1 Year | 64 x 45 x 42cm |
| Mega Box Filter Bio XL | 13,700 L | 9,100 L | 25w | 6,800 LPH | Filter Pump Premium 6,500 | 1 Year | 72 x 56 x 59cm |