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Home Pool Pool & Spa Filters Filter Cleaning Products Waterco MultiCyclone 50 Pre-Filter 2-Inch | 200375 200370
NOTICE: The pool & spa industry continues to face industry-wide shortages on many products that most vendors expect to last late into 2022. We're allowing items to be purchased so that customers who choose to wait will have their order shipped when product is available. Most vendors are not providing any ETA on when items will be available. WE WILL EMAIL YOU RIGHT AWAY IF YOUR ITEM IS BACKORDERED. 

Waterco MultiCyclone 50 Pre-Filter 2-Inch | 200375 200370

Waterco MultiCyclone 50 Pre-Filter 2-Inch | 200375 200370 Waterco MultiCyclone 50 Pre-Filter 2-Inch | 200375 200370 Waterco MultiCyclone 50 Pre-Filter 2-Inch | 200375 200370 Waterco MultiCyclone 50 Pre-Filter 2-Inch | 200375 200370 Waterco MultiCyclone 50 Pre-Filter 2-Inch | 200375 200370 Waterco MultiCyclone 50 Pre-Filter 2-Inch | 200375 200370

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Q & A
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MultiCyclone is a pre-filtration device that is capable of saving water and reducing filter maintenance. The MultiCyclone works on the basis of centrifugal water filtration. There are no moving parts to wear and tear, and no filter media to clean or replace. MultiCyclone is ideal as a pre-filter, extending the life of your existing filter and cutting water consumption as it eases the workload on your swimming pool filter.
  • MultiCyclone pre-filters up to 80% of the filter's incoming dirt load easing the workload of the swimming pool filter.
  • As the MultiCyclone intercepts more and more dirt, the flow rate remains unchanged.
  • Improving pool water circulation
  • Enhancing the performance of the automatic pool cleaner and in floor cleaning system
  • Allowing effective pool vacuuming without burdening the pool filter
  • Minimizing filter maintenance and saving water

Incoming water is guided by a diverter plate so that it enters multiple hydro cyclones tangentially, generating a strong centrifugal effect. This spins the sediment out to the hydro cyclone's wall and then spirals it down to the sediment sump, while the cleansed water spirals upwards. The accumulation of sediment can be visibly monitored through the Multi Cyclone's clear sediment pump. It is cleared by simply opening the purge valve. Only 15 litres of water is discharged to clean the unit of sediment.

The Multi Cyclone is ideal as a pre-filter to extend the life of your existing filter. The filtration efficiency of the Multi Cyclone was tested by feeding 5 to 80 micron dust particles through the Multi Cyclone and analyzing the percentage of dust particles trapped in the sediment bowl. The laboratory test revealed that the Multi Cyclone was effective in filtering particles sized 40 to 80 microns.

The unit works together with a sand, cartridge, bead or DE filter to polish the water. It allows the installation of finer filtration systems, such as cartridge filters with finer cartridges and the sand filters with finer filter media. The water ends up clearer with less up keep.

The unit is supplied with both 2"/63mm quick connect unions making this unit ideal for new installations and retrofit market. Minimum flow is 3m3/h, max. flow is 30m3/h. Max. pressure is 4 bar. The Multi Cyclone must be installed after the pump.

Swimming Pool and Spa Association (SPASA) most innovative product award 2008
Waterco's MultiCyclone centrifugal pre-filter has been awarded SPASA NSW, SPASA SA & SPASA QLD most innovative product award. The Swimming Pool & Spa Association (SPASA) is a non-profit organisation dedicated to maintaining and improving standards within the industry for the betterment of consumers, pool builders and suppliers. SPASA's panel of independent judges awarded Waterco's MultiCyclone centrifugal filter for its water saving features and its innovative method of filtering sediment without any filter media or moving parts.

NSF Certification
The MultiCyclone has been certified by NSF international; NSF tested the MultiCyclone for its structural integrity, head loss, turbidity removal, and clean ability. Its turbidity tests proved that the MultiCyclone was capable of filtering down to 30 microns. NSF International is a not-for-profit the world leader in standards development, product certification, education, and risk-management for public health and safety. The NSF Mark is recognized for its value in international trade around the world and is respected by regulatory agencies at the local, state, and federal levels.

Q & A
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Browse 12 questions Browse 12 questions and 40 answers
Is this pond safe?
Franny B on Jun 28, 2017
BEST ANSWER: the better question is does a pond system work without this ingenious device? The answer is: not as well!! Buy it...you filter love you for it..
How loud is the Multi Cyclone 50?
shane B on Mar 17, 2017
BEST ANSWER: I do not notice any noise coming from the cyclone. The pool pump and motor make noise, making the cyclone filter unnoticed. I use the cyclone as a pre filter to the pool's cartridge filter, which lengthens the time between cartridge filter cleaning.
I can imagine the 16 cyclones after a few years getting clogged. Can the unit be taken apart so they can be cleaned?
Alan H on Mar 25, 2018
BEST ANSWER: The unit has large ringlock at mid section for access to the clear bowl. Top portion above vortex nozzles is accessible via small bolts. In practice, neither is required for systems operating with normal basket filter on pump trapping large solids. The clear chamber will display a large volume of fine solids removed from water flow. Routine flushing is required to dispose of mass via 1" valve.
Is it ok to leave the waterco multicyclone runs during the winter? Or do I have to winterize it?
Nhan N on Aug 3, 2016
BEST ANSWER: This filter must be protected from freezing. If you drain the rest of your system, drain the cyclone as well.
Will liquid stablizer thru the skimmer end up in the cyclone rather than back to the pool?
John G on Jul 27, 2019
BEST ANSWER: No...only granular material. I did, however need to install a bypass so that I could continue to put DE powder in the skimmer. The cyclone was separating a good portion of this fine powder which surprised me.
does this work with a sand filter?
A shopper on Jun 3, 2020
BEST ANSWER: This is a pre filter..connects after the pump, and before the inlet to the filter. It remove a ton of solids to make the filter work better. I am using it on a pond with a bead filter, so I can not see any reason the would not work with a sand filter.
Does this filter create higher pressure, and perhaps require a stronger filter pump?
Reg G on Jul 6, 2020
BEST ANSWER: Your system won't even know it's there, except for the fact it takes a big load off of your filter! Best thing I have ever done for my pool besides salt water system!
Can you use this with a de filter ?
Andre on Nov 29, 2019
BEST ANSWER: I don't use a DE filter, but I have observed the cyclonic pre filter does collect fine material. DE is more than twice the density of water so it likely would clog the cyclones when loading the filter if you don't install a bypass.
My Cyclone has a slow dripping leak coming out of the draining valve. There is still sediment in the bottom even when I open it up to drain the sediment. Is it possible some of the sediment is keeping the valve from completely closing? If so do I need to take it apart to manually remove this sediment to fix my dripping leak?
PAUL M on Aug 27, 2020
BEST ANSWER: I have the same problem where sand or other crud will prevent the ball valve from closing completely. What I do is turn the pump down to low speed and work the value on and off. This normally clears up the problem.
can I purchase just the cleat bottom half of the Multicyclone 50?
We purchased 2 units a few years ago and the bottom portion on 1 has cracked at the bottom portion of the neck where the side fitting connects
Patty D on Apr 1, 2019
BEST ANSWER: The part that you are looking for is linked below.

Is it compatible with 1.5 inch plumbing?
A shopper on Dec 27, 2017
BEST ANSWER: Buy the 1.5 " ver if you have a 1.5" system or a pump that has 1.5" output. I bought the 2" ver and put it on a 1.5" pump output the rest of my system was 2", but my pump was a 1.5" it did not perform well the 2" on a 1.5' pump outlet. Hope this helps. Namaste
Does the pre filter come with 1 1\2 fittings?
Eric P on May 29, 2021
4.9 / 5.0
13 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
Works great!
This helps a lot by getting dirt/sand out BEFORE it gets into my cartridge filters so I don't have to clean them so often. I bought the house last year and it's my first pool so I was amazed by how much dirt/sand was in them the first time I cleaned them. I mentioned it to my son-in-law and he had one of these. I installed new filters and got this to help extend the cleaning times. You can literally see it working!
February 27, 2020
over 2 years ago
Rated 5 out of 5
excellent product
Removes very fine dust & silt material from the water before it gets to the filter. Uses very little water to clean. Extends back-washing the filter from 3 times a week to once a month. Huge savings on water & chemicals.
July 28, 2019
over 5 years ago
Rated 5 out of 5
Removes crud so you clean your cartrige filter less often
Cartridge filters are great, but cleaning them is a pain. The per-filter remove most of the crud in the water and allow it to be easily flushed out. This thing is really impressive looking and does its job.
January 16, 2017
over 5 years ago
Rated 5 out of 5
Great pre-filter to your main filter
spins out lots of tiny debri that would clog your pre-filter, low backpressure so you there is little pressure drop.
I find it a good product
March 26, 2018
over 4 years ago
Rated 5 out of 5
Amazing addition
At the recommendation of the owner of my pool service company I added the Multi Cyclone 50 pre-filter to my system when I had to replace an old cartridge filter. I am at a loss for words on the difference it makes. Using the Waterco pre-filter in conjunction with a Pentair Clean & Clear with fine filter media cartridges the water looks and feels amazing. The Multi Cyclone is catching sand particles (we live in the desert) before it gets to the cartridge filter. I empty it once a week with the quick turn of a valve and a half gallon or so later the dirt is gone. I expect to be able to go much longer between filter cleanings with the pre-filter installed. I highly recommend this to anyone living in a dusty environment!
October 17, 2018
over 3 years ago
Rated 5 out of 5
Must have!
My pool has never looked better! I would recommend this to anyone. Was easy to install, and works exactly as described! A+ product!
July 31, 2020
1 year ago
Rated 5 out of 5
Waterco MultiCyclone 50
Highly recommend this product. Very easy to install. My pool has never been as clean. Also it stays clean longer.
May 10, 2020
over 2 years ago
Rated 5 out of 5
Ordered this item with 2 others and so far this is the only piece that arrived. The box that this arrived in was all wet and torn open but from what I can see everything is in 1 piece. Learn a lesson about ordering pool equipment online.
March 17, 2021
1 year ago
Rated 5 out of 5
Best price around
best price and this pre filter is saving me time and trouble by keeping the dirt out of my filter system! Love it!
December 19, 2021
8 months ago
Rated 5 out of 5
Best Pre-filter ever
Works better than I imagined would definitely recommend.
Is great with the fine sand and dirt stopping it before it gets to the filter.
May 6, 2021
over 3 years ago
If a defect occurs in any Waterco product during the warranty period, Waterco will at its discretion, repair the product or replace and install the defective part, free of charge provided that the defect results solely from poor workmanship or materials and subject to these terms and conditions. Labour is covered by this warranty for a period of 12 months from the date of purchase or installation, within a 25 km (15 miles) radius of an authorised Waterco Service Agent. The purchaser is responsible for any freight incurred. Warranties are valid only within the original country of purchase. Our goods come with guarantees that cannot be excluded under the region's Consumer Law. You are entitled to a replacement or refund for a major failure.
All products sold by Waterco are covered by a one year warranty. The exceptions to this are the products listed in the schedule below (which also specifies relevant warranty periods). All warranty periods commence on the date of purchase by the end user. The provisions of this warranty are not transferable and are in addition to and not in modification of or subtraction from any applicable statutory warranties, rights or remedies.
All products sold by Waterco are covered by a one year warranty with the exception of the products listed below. Please note: Labour is covered by this warranty for a period of 12 months from the date of purchase or installation, within a 25 km (15 miles) radius of an authorised Waterco Service Agent.
Product Warranty Pro-Rata Warranty
• Wet Ends 3 Years  
• Hair & Lint pot lid, "o" ring, basket, impeller & diffuser 2 Years  
• Motor mechanical seal & capacitor 1 Year  
• ¹Portapac and Delta Spa & Bath Pumps 2 Years  
• ¹Fulflo pressure pump 2 Years  
• ¹Thermoplastic filter tank 5 Years 5 Years (Refer Column A)
• ¹Filament Wound / Exotuf filter tank 10 Years Not applicable
• ¹Cartridge / Bag filter tank 5 Years 5 Years (Refer Column A)
• ¹DE / Pearlite filter tank 3 Years 2 Years (Refer Column A)
• ¹MultiCyclone 12-16 Plus / Ultra 3 Years  
¹Except: All internal parts including fittings, valves,
gauges, cartridge elements, DE / Pearlite grids.
1 Year  
• All multiport valves used on media (granular) or
DE / Pearlite
1 Year  
• Controller / Feeder 3 Years  
• Sensor 1 Year  
• Electrochlor / Hydrochlor Chlorinator Cell 3 Years  
• Electrochlor / Hydrochlor Chlorinator Power Pack 3 Years  
¹&²HEAT PUMPS 3 Years  
• ¹Compressor 3 Years  
• ²Titanium Heat Exchanger 10 Years  
• All other components 2 Years  
GAS HEATER 2 Years  
DIGIHEAT 2 Years  
• Britestream LED Pool Lights 2 Years  
• Litestream LED Pool Lights 1 Year  
• Light Transformers 1 Year  
• Waterco Controllers 2 Years  
• Waterco Temperature Sensor 1 Year  
See attached warranty document for full warranty, including conditions, exclusions and pro-rata warranty terms.
This information was updated on 10/10/19. For the most current information and full warranty policy please visit www.waterco.us.

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