Cobalt Pond Puro Gravity Filter

Modular, multistage mechanical and biological filtration delivers pristine water quality for cleaner, healthier koi ponds. Cobalt Puro Gravity Filter is designed with the water garden and koi pond hobbyist in mind.

Italian engineering ensures easy assembly and maintenance featuring individual filter compartments that allow convenient media removal even while the system is still running. Clever bypass system maintains consistent water flow through the filter even if a media compartment becomes clogged. Latch closures secure lid onto filter unit.

Built from durable, UV and shock-resistant plastic, the Cobalt Pond Puro Gravity Filter provides years of reliable use. Available in 3 sizes, each comes factory-installed with media and includes plumbing accessories for quick, no-guesswork setup and installation.

Cobalt Pond Puro Gravity Filter features multiple stages of filtration. Each stage of filtration is specifically designed to complement the other media in the system, resulting in crystal clear, healthy water for your koi or goldfish!

Prefilter Brushes (Mechanical)
Tough, nylon bristle brushes screen out large debris (leaves, gravel, algae filament) before it reaches and clogs the Kinshi sponge.

Cobalt Kinshi Sponge (Mechanical/Biological)
Unique filter media designed specifically for filtering koi ponds. The innovative Kinshi material screens out particulates that pass through the Prefilter Brushes. The special low density mesh design is highly resistant to blockage and provides surface area for bacterial colonies to develop and guarantees effective biological filtration.

Filter Sponge (Mechanical/Biological)
Before returning to the pond, the water is filtered again by a fine filtering sponge which traps smaller waste particles for a final polish. The large surface area of the sponges also provides additional space for nitrifying bacteria to colonize, increasing the size of the biological filter (Sold separately for Puro 1).

Cobalt Bioglobes (Biological)
Spherically shaped Bioglobes are dedicated biological filter media specifically designed to provide the largest surface area for bacterial colonies to flourish, without restricting water flow.

Media Configuration

Downloadable 4-Stage Filtration PDF.
(Requires Adobe Acrobat Reader 4.0 or later - get it here for free)

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Please click "More Information" for installation and maintenance tips.

Install the sealing ring on the hose connector and screw it to the valve. Fasten the latter to the filter inlet using the proper sealing ring and lock it in place by joining the sleeve to the deflector. In order to operate, the Puro filter must be connected to a pump (not supplied). The valve provided with the filter must be used to adjust water flow in the filter inlet. For best performance, it is recommended to adjust the flow until you reach the level indicated on the "Water Level" label.

Maintenance
In order to maintain optimal filtration, it is recommended to periodically inspect the clogging status of the filtering media. Release the hooks and remove the covers. If the water level of the first basin reaches the four OVERFLOW holes, it is recommended to proceed with the filter maintenance. Disconnect the pump and wait until the filter is completely empty. Remove the baskets and wash the filtering materials with running water. To take out the basket next to the water inlet, it is necessary to first unscrew the sleeve with the deflector.

Do not use chemical detergents. Before reassembling the baskets, make sure you have completely removed the dirt present on the basin's bottom. Reassemble the baskets in the filter paying attention that the numbers present on the basin correspond to those indicated on the baskets. These will be correctly placed only if the basket frame is inserted into the corresponding track all the way up to the coupling. Close the covers paying attention to the joining hooks.