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Frequently Asked Questions

• The pump could be too powerful, so the Nexus is being emptied before the pond refills it by gravity.

• There could be a blockage in the transfer port between the inner and chamber and the outer chamber. You need to back flush it. You can download the instructions to backflush here.

• The Eazy needs cleaning. Or the Eazy’s steel screen needs cleaning. Beware of sharp edges!

Maximum recommended flow on the 220 is 10,000lph and the 320 is 13,000lph, however suggested flow rates are lower. Slower is better for fine removal and clearer water. Aim to turn over your pond volume every two to three hours. The Evolution Aqua Varipump range are adjustable, and consume less energy when you turn them down.

Yes, it can easily be adapted to either filtration method by simply swapping the supplied rubber boots.

The Nexus 220 comes with 18 litres of K1 Micro in the Eazy (inner chamber,) and 50 litres of K1 in the outer chamber.

The Nexus 320 comes with 20 litres of K1 Micro in the Eazy (inner chamber,) and 100 litres of K1 in the outer chamber.

For older models, the 300 and 310 contained 40 litres of K1 in the Eazy, and 30 litres for the 200 and 210.

Don’t change the amount of media in the Eazy as this affects particle capture, and ease of cleaning. The amount of media in the outer chamber can be increased however by up to 150 litres in total in the 220 and 300 litres in the 320 models.

Only increase the amount of media in the outer chambers for heavy stocking and heavy feeding. Note that if the total volume of media is increased in a newly set up filter it will take longer to mature, as there is more surface area for bacteria to colonise and the biofilm will be more thinly spread.

K1 Media can be purchased from your Evolution Aqua dealer, code MEDIA25L for 25 litres, and code MEDIA50L for 50 litre bags.

Yes, it powers the moving bed biological filter and is also vital to the cleaning process. You need an Evolution Aqua airpump 75 for a Nexus 220 and an airpump 95 for a Nexus 320. If you increase the amount of media in the outer chamber you may well need a more powerful airpump.

The correct size airpump to enable K1 Media to move is detailed in the below:

  • 50-75 litres airpump75 
  • 75-100 litres airpump 95 
  • 100-150 litres airpump 
  • 130 150-300 litres airpump 150

The Automatic is a separate system which can be fitted to Nexus filters, to enable automatic cleaning. By combining timers and automatic valves, Nexus can be converted and set to clean itself, as little or as often as required. It can be set to clean at night or while you are on holiday, and once set it means total hands-off cleaning. The more your filter is cleaned, the more that waste is removed from the system before being broken down. That means a cleaner pond, cleaner filter and healthier water.

The Automatic System can be fitted to all Nexus models manufactured after 2006, and both gravity fed or pump fed models. It can be fitted by the user or a pond filter installer. The Automatic system still requires a Nexus, airpump and a water pump, along with a power supply. During cleaning the Nexus will expel dirty water to waste, so an auto top-up fitted to the pond (not supplied,) is advised if the filter is set to clean frequently.