Nexus Eazy 220+ Koi Pond Filter (Pump Fed)

Cascade Koi & Aquatics are renowned for being one of the largest retail sellers of  The Nexus Eazy 220+ filtration systems. They provide significantly improved degrees of clearness for fish ponds. Structure on the success of the award winning Nexus array this new generation of filters smartly integrate mechanical as well as biological filtering right into one advanced filter system, whilst being exceptionally very easy to clean and also basic to install.

Advanced filtration systems for Koi ponds now with NEW K+Media

Evolution Aqua have launched the Nexus320+ and Nexus220+filtration systems. Building on the tried and tested technology that has been ever present in the world renowned Nexus, the team at Evolution Aqua have gone even further to enhance their number one Koi pond filter.

 The Nexus320+ and Nexus220+ filters now come with a brand new filter media called K+Media in the moving bed outer chamber for greatly improved biological filtration and much faster filter maturation. The new Nexus+ filters are also supplied “auto ready”, with factory fitted fixings already in place, making it even easier to upgrade to the Nexus Automatic Cleaning System.

How the Nexus+ Works

The Nexus+ filter is an innovative biological and mechanical filter system in one. Water from the pond enters the Nexus+ via the inlet into the inner chamber which works as a vortex allowing larger solids to settle out. The water then passes through Eazy filter, where finer particles are removed at the mechanical stage of filtration, thanks to the static bed of K1 Micro filter media.

The mechanically clean water then passes to the outside chamber of the Nexus+ where the new K+Media Moving Bed is located for biological treatment prior to being returned to the pond. At this stage, biological breakdown occurs through different strains of bacteria and filter feeders living on the vast protected surface area of each piece of the K+Media. These bacteria convert Ammonia and Nitrite into less harmful Nitrate. Water then passes through the exit grill into the outlet, returning back to the pond.

The Nexus 220+ includes a re-designed Eazy filter which now uses the all new K1 Micro filter media, in a fixed bed, to provide improved levels of mechanical purification. The Nexus filter systems additionally utilize the acclaimed KPlus Media in the relocating bed to deliver superior levels of biological filtration. With each other this mix of filter media work to deliver crystal clear and also healthy water.

All Nexus filtering systems can be set up on pump fed or gravity fed setups depending upon your fish pond setup. The Nexus 220 appropriates for fish ponds up to 18,000 litres (4,000 gallons) while for larger ponds the Nexus 320 can be set up on fish ponds as much as 34,000 litres (7,500 gallons).
Water from the fish pond enters the nexus via the inlet into the inner chamber which functions as a vortex enabling larger solids to resolve out.

Water then goes through the grills in the stainless-steel Eazy filter, where the finer fragments are gotten rid of at the mechanical phase of purification, thanks to the static bed of our award winning K1 Micro filter media.

The mechanically clean water then passes to the outside chamber of the nexus where the K1 Media moving bed lies for organic therapy before being gone back to the fish pond.

At this stage, organic break down takes place with various pressures of microorganisms and filter feeders residing on the protected area of each item of the K1 Media. These germs transform Ammonia as well as Nitrite into safe Nitrate.

Water then goes through the leave grill right into the electrical outlet, returning back to the pond.
The Eazy is a stainless-steel vessel having a set quantity of K1 Micro Media (20 litres in the Nexus 320 as well as 18 litres in the Nexus 220) which lies within the inner chamber of the Nexus. After water gets in the Nexus it turns around the Eazy in the internal chamber with a down motion allowing the bigger solids to resolve to the bottom of the chamber before passing through the slots of the Eazy right into the static K1 Micro. The water streams from all angles with the K1 Micro where enhanced mechanical filtration and negotiation occurs and also great particles are captured within the K1 Micro. The water after that flows via the slots in the centre column as well as right into the outer chamber.
The outer chamber of the Nexus consists of the moving bed of K1 Media. 100 litres of K1 Media is supplied with the Nexus 320 with the choice to add an additional 200 litres of K1 Media ought to it be required. The Nexus 220 is provided with 50 litres of K1 Media, with the choice to add an added 100 litres of K1 Media if needed. This permits the biological capability of your filter to expand with your fish.

The outer chamber is where the last of organic treatment takes place. Organic malfunction takes place with various stress of germs surviving on the protected surface area on each piece of the K1 Media. These bacteria transform Ammonia and also Nitrite right into harmless Nitrate. The amount of Ammonia as well as Nitrite generated in the fish pond is dependent on feed prices as well as the kind of food made use of. For higher feed prices extra K1 Media should be included into the external chamber.
You could enhance the biological capability of your Nexus by including added K1 Media right into the external chamber. You will nevertheless should make sure that you have the correct size of air pump to make it possible for the K1 Media to relocate completely (see table for suggested size of air pump).

For Nexus filtration systems straight out of the box without additional media added, we advise an Air Pump 75 to power the relocating bed in a Nexus 220 as well as an Air Pump 95 for a Nexus 320.
Nexus purification systems can be installed on PUMP FED or GRAVITY FED set-ups. In all situations the Nexus MUST be set up on a strong, level base, a minimum of 1.2 metres x 1 metre.

Pump Fed Set-Ups
By this we indicate that if your pump is most likely to be made use of to provide the water to the filter, and the filtered water after that returns back into your pond via gravity, i.e. down a waterfall, or via a large size pipe, this is referred to as PUMP FED (i.e. the water is fed to the filter using a pump).

Gravity Fed Set-Ups
By this we imply that your pump is going to be utilized to return the filtered water to the fish pond and also therefore your filter will be supplied by gravity via a bigger size pipeline. In this situation the water level in the filter will certainly go to the very same degree as the fish pond.

Frequently Asked Questions

The water level in the outer chamber is much lower than in the inner chamber. Why?

• 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.

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

What size pump do I need?

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.

Can NexusPlus be gravity or pump-fed?

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

How much media does NexusPlus have/need?

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

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

Media can be purchased from your Evolution Aqua dealer.

Do I need an airpump for NexusPlus?

Yes, it powers the moving bed biological filter and is also vital to the cleaning process. You need an Evolution Aqua Air Pump 75 for a Nexus 220 and an Air Pump 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 the filter media to move is detailed in the below:

• 50 - 75 litres = Use an Air Pump 75
• 75 - 100 litres = Use an Air Pump 95
• 100 - 150 litres = Use an Air Pump 130
• 150 - 300 litres = Use an Air Pump 150

What is Nexus Automatic?

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.

How long is the standpipe for the return in a NexusPlus that is pump-fed?

The return pipe is 40.5cm long in the 220 and 46cm long in the 320. This is a length of 4" pressure pipe which is factory fitted during production to the return chamber of the Nexus and sets the level of the water in the Nexus. It is removed when using the Nexus in a gravity fed pond. This can be quite difficult to retro fit as the hole is quite tight, you may find it easier using 110mm soil pipe as this has a slightly smaller outer diameter.

How much water is in the NexusPlus?

Nexus 220+

• Total volume of water 510 litres / 112 UK gallons / 135 US gallons
• Outer chamber 405 litres / 89 UK gallons / 107 US gallons
• Inner chamber 105 litres / 23 UK gallons / 28 US gallons

Nexus 320+

• Total volume of water 840 litres / 185 UK gallons / 222 US gallons
• Outer chamber 635 litres / 140 UK gallons / 168 US gallons
• Inner chamber 205 litres / 45 UK gallons / 54 US gallons

Waste not draining to waste when valve is opened.

Remove the outside union on the waste ball valve, open the valve, if no water pours out the blockage is under the Nexus, carefully push a suitable stick (such as a cane) and release the blockage, you can also remove the Eazy and access the pipe from the 1.5" hole in the bottom of the Nexus inner chamber.

How can I extend the draining time of my Nexus 320 Automatic.

You first need to remove the sticker of the far right side box and change the dial with a small screwdriver from 5 to 4, this will extend the cleaning time by one minute.