K1 Microbead
K1 MicroBead

Introducing Evolution Aqua's latest innovation in pond filtration technology, the K+Advanced Filters. Manufactured by Evolution Aqua in the UK, this new range of pressure filters have been specifically designed to use Evolution Aqua’s own filtration media, K+Media, to deliver exceptional water clarity and to be economical to run. They are simple to install and can be used as a standalone filter or as part of a larger filtration system with a Nexus+ or on a skimmer line. The K+Advanced Filters are incredibly easy to clean and are supplied with K+Media, pipework, air blower and a multi-port valve.

Key features and benefits

Specifically designed for use with advanced K+Media
Filters are engineered to maximise pump efficiency
K+Media enhances mechanical and biological filtration
Use as a standalone filter or as part of a larger filtration system­
Simple to install, easy to clean and maintain
Double lateral configuration to ensure laminar flow
Unique, engineered lateral design to optimise filtration

Where to buy

Dealer Locator

ModelMax. pond sizeMax. flow rateDiameterVolume of
Multi-port Valve SizePipework Size
K+AdvancedFilter2018,000 Litres
4,000 UK Gallons
4,800 US Gallons
6,000 Lph
1,320 Gph
1,585 US Gph
20"50 Litres1½"1½"
K+AdvancedFilter2436,000 Litres
8,000 UK Gallons
9,600 US Gallons
12,000 Lph
2,640 Gph
3,170 US Gph
24"100 Litres2"2"
K+AdvancedFilter3054,500 Litres
12,000 UK Gallons
14,500 US Gallons
18,000 Lph
3,960 Gph
4,755 US Gph
30"150 Litres2"2"
K+AdvancedFilter3691,000 Litres
20,000 UK Gallons
24,000 US Gallons
30,000 Lph
6,600 Gph
7,925 US Gph
36"250 Litres2"2"

How it works

Water ispumped into the filter from the pond, through the multi-port valve where the internal pipework directs the water to the bottom laterals.

As the water flows upwards inside the K+Advanced Filter, dirt, debris and waste are trapped within the mass of K+Media that floats at the top of the filter. The vast protected surface area provided by K+Media also provides a home for beneficial bacteria, delivering mechanical and biological filtration.

The filtered water flows back through the laterals and pipework at the top of the filter, through the multi-port valve and back down the return line into the pond.

The K+Advanced Filter, is incredibly easy to clean by simply moving the handle on the multi-port valve into the corresponding positions to perform a backwash and rinse which flushes out the waste trapped inside.

Installing the K1 Micro Bead

The K1 Micro Bead Filter can be installed as shown above if you are planning to use a pre-filter such as the Evolution Aqua Cetus Sieve. If you are not planning to use a pre-filter we highly recommend that you fit a strainer basket to the pump.

This will prevent leaves, string algae etc. from entering the filter and pump. * It is recommended that all pipework on the pump side (from the pump to the filter and back to the pond) is installed on 2” pipe. Please note on the K1MicroBead20 Filter you will have to reduce your pipe down to 1½” to connect to the multi-port valve. This will ensure that your pump is working at its maximum flow.


The recommended flow rate for the K1 MicroBead filters is to circulate the total pond volume through the filter every 2-3 hours, so if you have a 20000 litre pond, circulating 7000 and 10000 litres per hour would be ideal.

No, one of the great advantages of the K1 MicroBead filters is they produce very little back pressure, so you can use a lower wattage pump saving you money!

Whilst a pre-filter such as the Cetus Sieve will reduce the cleaning frequency of the K1 MicroBead, it is not a requirement.

No, the Cetus will need to be gravity fed to install before a K1 MicroBead filter.

Yes, the K1 MicroBead are designed to be used with or without a pre-filter.

Yes, the K1 MicroBead filters are ideal for use on skimmer lines.

The maximum flow is dictated by the pond size, there is no maximum flow rate specified. We recommend passing the pond volume thorough the filter every 2-3 hours, so for a 20'000litre pond the recommended flow would be 10'000lph

Typically in summer the filter will require cleaning once or twice a week, however every pond if different and cleaning requirement will vary depending on stocking density, exposure to sun and other variables.

1. Insufficient filtration time
2. Low flow
3. Dirty filter requires rinsing and backwashing
4. Pump has blocked.
5. Inlet line is blocked.
6. Pump is not primed.
7. Incorrect water chemistry. Check pH and other water readings. Check UV is working correctly (replace UV bulbs older than 6 - 12 months).
8. Clogged or channelled media. Perform an extra long rinse and backwash.

Too much algae. Excessive water flow and pressure. Check pump size. Overloaded with fish. Excessive feeding. Filter blocked through calcium.

Scoring or jamming with foreign matter or debris. If this condition persists after rinsing, disassemble the valve to clear. Continued operation may result in leaking due to damage to the multi-port valve (spider gasket). See dealer or installer.

  • Switching the Air Blower ON and OFF 2 or 3 times and performing multiple rinses can free up media.
  • Performing a backwash prior to following the cleaning instructions can free up the media.
  • Operating the filter on re-circulate will determine if the restriction is in the filter.
  • If you don’t succeed when following the two points above, switch off the pump, isolate and drain the filter. Manually drain the filter, remove the lid and inspect the inside of the unit. The media may need to be removed and cleaned.

The free area within the media means that there will never be a rise in pressure (no matter how dirty the filter gets) and the pressure gauge may never register any pressure in the system. The pressure gauge in this instance is more of a warning system to show if any valve is closed and the pump is running.

K1 MicroBead Filter Manual

K1 MicroBead Manual

MicroBead Spares

MicroBead Spares