Evolution Aqua Cetus Sieve Replacement Bellows

Evolution Aqua Cetus Sieve Replacement Bellows

The model-specific flexible replacement for maintaining your Cetus Sieve

This Evolution Aqua replacement bellows is supplied for the Cetus Sieve and identified by the manufacturer as CETUSBELLOW. It allows the bellows component to be replaced during repair of an existing unit. Our supplier reference is PF301, so either code can help identify the correct item when discussing your filter.

The listing supplies the bellows component. Retaining clips are listed separately by Evolution Aqua, and the sieve screen, external pipework fittings and complete filter are different products. Check the condition of the surrounding components before ordering so that everything required for the repair can be arranged together.

Part identification

Manufacturer	Evolution Aqua
Compatible equipment	Cetus Sieve
Replacement part	Flexible bellows
Manufacturer code	CETUSBELLOW
Supplier code	PF301
Retaining clips	Separate spares; inspect existing clips

How it relates to the Cetus assembly

The Evolution Aqua Cetus Sieve is a mechanical pre-filter that removes waste before water passes to the next filtration stage. Its gravity-fed arrangement uses an automatically adjusting weir. The bellows belongs to that moving inlet assembly, where secure connections and freedom of movement both matter.

Evolution Aqua’s quality checks specifically include confirming that the weir moves freely and that the bellows is firmly attached at the top and bottom. Those are useful points to discuss with your installer when assessing an existing Cetus. Replacing the flexible part should restore the intended assembly, rather than alter how the filter regulates its water supply.

Confirm the fault before selecting a replacement

If the filter is leaking or not operating normally, identify where the problem occurs before assuming the bellows is responsible. Record whether water is escaping around an attachment or through visible damage in the flexible component. Clear photographs of the whole assembly and the affected area will make a parts enquiry more useful.

A new bellows cannot correct every cause of abnormal sieve operation. The Cetus installation manual also addresses equipment level, pump position and the layout of gravity-fed and pump-fed systems. If symptoms continue without visible bellows damage, have the installation and water path assessed rather than replacing parts on the basis of water level alone.

Check the retaining clips at the same time

Evolution Aqua lists separate bellows hose clips. Its listing for clip 2 uses reference HC90-110 and states that clip 1 is also required. These are separate positions in the assembly, so do not assume that ordering two identical clips is the correct way to renew all the fittings.

Inspect the existing clips and attachment areas while access is available. Check whether the clips are serviceable and can secure the replacement correctly. If you need additional parts, send photographs of both attachment points and quote the filter and bellows reference so the correct components can be checked before dismantling begins.

Prepare for maintenance

The Cetus manual requires electrical isolation and the water supply to be turned off before maintenance. Plan how the relevant part of your filtration system will be isolated, and arrange the tools, replacement component and any additional fittings before starting. The correct sequence depends on your actual pond installation.

Allow enough access to work without straining adjacent pipework or the moving assembly. Take photographs before removing the old component so there is a record of its arrangement. Keep removed fittings together and inspect them before reuse. If the installation differs from the manufacturer’s diagrams, seek appropriate technical advice before continuing.

Fitting and checking the repaired assembly

Follow the manufacturer’s instructions and obtain model-specific fitting advice where needed. Do not choose an adhesive, lubricant or tightening setting by guesswork. The fact that a spare is flexible does not make it interchangeable with a general-purpose hose or plumbing connector.

After fitting, check that both attachments are secure and that movement is unobstructed. Restore the system in a controlled manner, observe it for leaks and confirm normal operation before leaving it unattended. If a connection leaks or the assembly binds, stop and resolve the cause rather than relying on further force at a clip.

Information to send with a parts enquiry

For help identifying this spare, contact That Pond Guy with the Cetus model details, photographs of the existing bellows and a short description of the fault. Include any known alterations to the filter or connections, as these may affect the advice required.

Keep the part reference and repair date with your pond-maintenance records after the work is complete. These details provide a useful starting point if you need another spare later, and help distinguish this bellows from the separate screen, hose clips and external connectors used elsewhere on the Cetus.