You need to investigate the power to your unit.
• Has your RCD tripped? If yes, check your wiring and reset.
• Examine the UV bulb for signs of failure, and replace if necessary.
• Is the UV bulb fitted correctly? Unscrew the end caps and ensure correct fitting as per the instructions as described in this manual.
• Are the end caps dry? If not, allow to dry thoroughly. We recommend the use of a hair-dryer for this.
• Possible ballast failure. The ballast in your aquarium can easily be replaced.

This could be caused by an incorrectly fitted, damaged or overtightened O-ring on the quartz sleeve. Please check the quartz sleeve O-ring, reposition it or if necessary replace it with a new one. IMPORTANT: Do not fit the bulb socket or end cap until the issue is solved. If water enters the bulb socket it can cause irreparable damage to bulb socket and ballast. Damage caused by improper fitting of the quartz sleeve, o-rings and locking nuts are not covered under warranty.

In order to be an effective steriliser the void space inside evoUV has been narrowed to force the water closer to the harmful UV. This is deliberate and a reduction in pump flow is expected. For greater flow capability connect multiple evoUV devices in parallel. Note high flow rates are not conducive to effective sterilisation results. For optimum sterilisation through an evoUV a small, restricted flow should always be used. This helps to ensure a long exposure to harmful UV, every time disease pathogens pass.

This means that the hose used is not a perfect match in terms of its internal diameter and wall diameter. A marine safe hose clip (not supplied,) will prevent this by fitting one on each hosetail and tightening it.

This means that the nut has not been correctly tightened, or has not properly threaded onto the male thread. Check that the rubber washer is inside the nut (important,) then refit it and do it up. PTFE tape can be added for a greater seal around the male thread (not supplied).

For optimum sterilisation results change the bulb every six months.

No. The evoUV can only ever be effective on the water borne life stage of some disease pathogens. It is not effective on any disease which is already on the fish’s body and does not have a mobile, water borne life stage. evoUV can be effective at lowering numbers of water borne pathogens and helping to prevent the spread of pathogens from tank to tank on centralised fish systems, if set up correctly. It can only ever be effective on pathogens which pass inside the unit, and are directly exposed to the harmful UV rays emitted by the UV bulb. If this is the case, it can be a very effective at lowering pathogen numbers in the water and helping to spread water borne pathogens from tank to tank.

Yes, this is because the Ultra Violet light may degrade the medication being administered to the water. Read the instructions provided with the medication and take the manufacturer’s advice.