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Home Pentair Fiberglass D.E. Filter FNS Plus | 60 Square Feet | EC-180009
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Pentair Fiberglass D.E. Filter FNS Plus | 60 Square Feet | EC-180009

Pentair Fiberglass D.E. Filter FNS Plus | 60 Square Feet | EC-180009 Pentair Fiberglass D.E. Filter FNS Plus | 60 Square Feet | EC-180009 Pentair Fiberglass D.E. Filter FNS Plus | 60 Square Feet | EC-180009

Parts AvailableParts Available
Platinum Preferred Manufacturer
  • Requires the use of a backwash valve or adapters (listed under purchase options)
  • High FlowTM manual air relief valve and continuous internal air relief work together to maintain efficient filtration and prevent over-pressurization.
  • Easily accessible 2" drain for efficient cleanout.
  • Online part number EC-180009 is the direct replacement for part number 180009
Q & A
  • Pentair Backwash Valve for use with DE & Sand Filters | Push-Pull Valve | 2" PVC with Unions | 263064
    Pentair 2" PVC Push-Pull Backwash Valve - DE/Sand Filters - 263064

  • Pentair FullFloXF High Performance Backwash Valve For FNS Plus D.E. Filters 2.5"x3" | 263081
    Pentair FullFloXF High Performance Backwash Valve
    FNS Plus D.E. Filters
    2.5"x3" | 263081

  • Fiber Clear Cellulose Powder Filter Media | Replaces Diatomaceous Earth | 3 lbs. | FCR-048B
    Fiber Clear Powder Filter Media | Replaces D.E. | 3 lbs. | FCR-048B

  • Pentair Hi-Flow Multi-Port PVC Backwash Valve for Side Mounted  D.E. Filters | 261142
    Pentair Multi-Port HiFlow PVC Backwash Valve - DE Filters - 261142

  • Pentair 1.5" & 2" Threaded Adapter Kit | 271096
    1-1/2 & 2 in. Threaded adapter kit for installations without valve | 271096 (Good)

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

FNS® Plus Filters are fiberglass reinforced polypropylene of advanced chemical resistant materials for superior strength and reliability. The top manifold design features the Service-Ease grid pack for convenient one-at-a-time grid servicing. Filtering with diatomaceous earth (D.E.) gives you water that really sparkles. That's because D.E. filters remove the tiniest of contaminants¦particles as small as 5 microns. (An average grain of sand is 1000 microns!) Even though these particles can't be seen individually, collectively they greatly affect water clarity.

Diatomaceous earth filters work so well because water passes through a series of D.E. coated grids. Under a microscope, D.E. looks like a collection of tiny sponges. And just like a sponge, water can pass through, but microscopic impurities like dirt, algae, and some forms of bacteria can't.

FNS® Plus D.E. Filters have been designed with curved grids to maximize filtration area. More filter area means better performance and longer periods between cleanings. Our exclusive internal design has been refined to minimize fl ow restrictions, and therefore requires minimal pumping power to achieve a needed fl ow rate. That means lower utility costs.

In addition to providing the clearest possible water, FNS Plus was also designed for easy maintenance and long-term reliability. So you can count on it to keep your pool's water clean and crystal clear for years to come.


·         Curved vertical grids provide maximum filter surface area for greater dirt-trapping capacity and longer periods between cleanings.

·         Unique internal design ensures optimum filtration and backwashing efficiency.

·         Chemical resistant, fiberglass reinforced polypropylene tank for exceptional strength and long life.

·         Easily removable filter grid pack to simplify maintenance and save you time.

Brand: Pentair
Square Foot
Grid Type
Q & A
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 34 questions Browse 34 questions and 33 answers
Does this come with new o-rings for the input and output lines that connect to the existing backwash valve, or do they need to be ordered separately? Thanks!
ian s on Jun 11, 2019
Is this in stock?
A shopper on Mar 8, 2021
I’m replacing a pentair 48 are the inlets/outlets the same size and in the same position ?
Cliff M on Apr 25, 2019
instructions to open a ten thousand gallon pool?
Joy A on May 30, 2016
BEST ANSWER: This filter is over kill for 10,000 gals.
It does not say in the description, does it come with the grids?
G P on Oct 26, 2016
BEST ANSWER: Yes it comes with the grids. Connect to your filter valve and load with DE and you're good to go.
how do you winterize Pentair DE filter ?
A shopper on Jun 19, 2021
BEST ANSWER: I’m really cold climates…Best to backwash and leave the valve open when done. Easy way is to simply open the relief valve on top if not in freezing temps.
does it come with the grids for sure ?
A shopper on Nov 26, 2020
BEST ANSWER: Been awhile since I bought it but I'm pretty sure it was the complete unit with grids. All I had to do was hook it up and add de to my skimmer. Great product, still going.
will this filter clean a 32000 gal pool?
james d on Sep 22, 2018
BEST ANSWER: Yes. Will easily clean that size of pool. My pool is 38000 gallon and is crystal clear
Does this filter have a filter to drain feature/cycle?
SimpleSimon on Jul 28, 2018
BEST ANSWER: This is just a filter. The selection to drain is on your selector valve. The valve doesn’t come with the filter. Filter does have a plug in the bottom to drain filter.
I have the slightly older version of this filter. It sat in the direct afternoon sun for 13 years. Will the newer one last longer in a pump house protected from the elements, or is this the average life of one of these?
Michael C on Jun 5, 2020
BEST ANSWER: 13 years is of about as good as you can expect in direct sunlight. You are far better off having shelter from the Sun and can probably expect several more years
does this include the filters inside the unit? Can this replace a FNS 48 with ease and be able to use the same ports with no replacement of the piping?
jenn d on May 1, 2020
BEST ANSWER: Yes filter plates are in it, and there is some repiping to do
Also have to but their valve assembly
I have a purex triton 60 will this replace it and fit my current valve multiport?
Michael K on Mar 25, 2017
BEST ANSWER: Piping should be close. When I replaced mine I wanted to avoid repiping if possible.When installing you will need to raise the unit about 1/2 an inch (or at least I did due to my cement pad). Take off plastic nuts provided and I then slid unit as close as possible. Then ensured a good connection (you may have to slightly pull the PVC pipes/with nuts apart then tighten nuts. Take your time and work it slow. Buy a strap wrench also to loosed and tighten big plastic nuts.. If you do have to redo the PVC pipes this can be done easily with help from your local home improvement store. Take pictures and measurements and they can help you mock it up before gluing.
When would you use the recirculation on the multi port?
A shopper on Jun 15, 2016
BEST ANSWER: If the filter media was down for maintenance, normally the whole system is shut off. With the RECIRCULATE selected on the multiport valve, the pool circulation system could be turned back on and would still function bypassing the filter in the recirculate mode. This would allow powered sanitizers, (e.g., salt cell, inline chlorinator, ozone system, etc.) to continue to function while the filter system was inoperable for cleaning or a grid repair. This would also allow your heater and solar heater to continue functioning.
A shopper on Jul 5, 2020
BEST ANSWER: I have a 20k gal pool and the 60sq ft filter has worked great.
How far away can a skimmer be from the filter to add the DE?
A shopper on Jun 9, 2017
BEST ANSWER: As long as there is good suction, the liguified solution of DE can travel any length to reach the filter
When do you use the recirculation on the multi port?
A shopper on Jun 15, 2016
BEST ANSWER: I Have mine set up on the water going in and water going out port's with a backwash value .
Take care
Will this filter replace an American Products Titan Vertical Grid Filter 60 sq ft Model #58609000? Thank you
A shopper on Apr 25, 2016
BEST ANSWER: Not sure if it's a direct fit but any pool installer can easily fix that. The vertical replacement would be more like the Pentair quad
would this filter(180009) replace Titan Vertical filter 56623200?
A shopper on Mar 15, 2016
BEST ANSWER: That is correct. This would be the new version of that filter.
I have a pentair ( purex-triton) nautilus fns 60 which has been replaced by the fns plus. What are the issues in replacing with the plus? I am told the ports are 1 inch higher, are they still the same distance apart and can I just build a higher base to accommodate this?
David on Dec 30, 2015
BEST ANSWER: I replaced my with a like part and all the ports matched up perfectly. With that being said the whole deal took me 25 minutes to swap it out. It is so simply to do even if you had to raise the base a little
is this in stock? Pentair FNS Plus 60 Sq.Ft. DE Filter PAC-05-186
A shopper on Aug 11, 2021
what gallon pool will this filter handle ?
A shopper on Jun 7, 2021
Is this in stock?
A shopper on May 30, 2021
Do I need to buy anything else with the 60 square feet ?
A shopper on May 15, 2021
Do yall have the de pentair fns 60 in stock ?
Kenneth J on Apr 21, 2021
Is a filter lid 180009 the same as 170022??
Bart R on Mar 28, 2021
Do you have the Pentair 180009 FNS in stock?
Dan K on Mar 25, 2021
Is this available? : Pentair Fiberglass D.E. Filter FNS Plus | 60 Square Feet | 180009
A shopper on Mar 2, 2021
How large of a pool can this handle?
A shopper on Jan 9, 2021
I have this filter. If I use the pump to drain water off the pool, do I have to recharge the DE before running the filter again?
A shopper on Aug 28, 2020
4.9 / 5.0
13 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
Exact replacement for the previous filter I had. Original lasted 10 years so decided to do the same model. Took only a total of 60 minutes to take out the old and replace with new one.
February 5, 2018
over 4 years ago
Rated 5 out of 5
Works like a charm
This is an exact replacement for the previous filter that lasted 12 years +. Easy swap out and is working exactly as expected.

Excellent Price and very fast delivery from Pool Supply Unlimited.
February 7, 2018
over 4 years ago
Rated 5 out of 5
Very satisfied
The box came in very good condition with A cone on the top so that no box be put on top of it. I opened the box but I still didn't take it out. It looked in good condition. I still don't have time to install yet.
December 20, 2016
over 5 years ago
Rated 5 out of 5
Bigger is better
I had a smaller sand filter forever and I was tired of it. I called PSU and wanted some advice and information about the different filter types. The customer service was superb and they took all the time I needed to feel comfortable with my decision. The DE filter works great and seems to keep the water more clear than the sand filter I had.
February 9, 2014
Rated 5 out of 5
Easy transition
This product came ready to be installed in the box, superb quality. The filter install was a bit complicated because it replaced a 600 lb sand filter, and removing the sand filter and plumbing the new unit took a full day. It is the same as the filter it replaced and all connections were correct. Very pleased.
April 1, 2016
Rated 5 out of 5
Great filter so far! Just make sure you have enough height clearance for this filter as it will require some room! But definitely recommend it for larger pools and the matching multiport valve!
July 24, 2020
1 year ago
Rated 5 out of 5
DE 60sq ft filter
This DE filter was a direct replacement. Very easy to change.
February 7, 2018
over 4 years ago
Rated 5 out of 5
Great equipment - great value.
Excellent product, great price. My pool service technician had a quick and easy installation with correct fit of all parts. Up and running and performing to specifications. Expect many years of service out of this product.
February 7, 2018
over 4 years ago
Rated 5 out of 5
Great Product
Have had great luck with filter works Great! Love that everything come apart with ease. Clean it at shutdown of pool and reassemble.
June 14, 2019
over 4 years ago
Rated 4 out of 5
Two weeks in and it is working great. Pool Supply Unlimited was great.
March 6, 2018
over 3 years ago
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Register your Pentair product online at www.pentair.com.

You've always been able to count on the quality and long service life of Pentair products. Pentair uses state of the art workmanship, materials and manufacturing processes to create the most innovative pool and spa equipment anywhere. And now Pentair products can deliver even more value and peace of mind, because Pentair offers extended warranty coverage on select products that are installed by a qualified installer*.
While the majority of Pentair products are covered by a sixty- (60) day warranty, a select number of products qualify for extended warranty coverage.
Select Bundled Products: applies to purchases and qualified installation of a minimum of a pump and filter, and one or more of the following: heaters, heat pumps, control systems, automatic cleaners, lighting, salt chlorine generators or UV sterilizer**
*Note: Qualified Installer - Defined as a licensed professional who charges a fee for his services, and possesses a business license, contractor's license and/or resale permit. Common examples of a "qualified installer" include: Swimming Pool, Home Repair or Landscape Professional; Plumber or Electrician; General Contractor; Heating and Air Conditioning Specialist.
**Note: Bundled products - must be purchased on the same invoice and installed at the same time. If any product within a bundle is ineligible for the bundled warranty coverage then all products within the same bundle will be disqualified from receiving the three (3) year extended warranty coverage for bundled products.
TradeGrade products must be purchased from a retail store (brick & mortar), pool builder or pool service company to receive a one-year, two-year or three-year warranty. If purchased online will only receive a sixty-day limited warranty. View the list of TradeGrade Products.
Ecommerce (EC) products: Products purchased from an Authorized Pentair Online Reseller (products beginning with EC-) receive a one (1) year (parts only) warranty from the date of purchase. The exceptions are: IntelliChlor cells and IntelliFlo SVRS pumps which receive a two (2) year warranty. EC products are not eligible for the bundled three (3) year extended warranty.
Visit www.pentair.com to submit your product warranty registration.
This information was updated on 11/19/2021. For the most current information and full warranty policy please visit www.pentair.com/warranty.

 Adobe Acrobat PDF Warranty Information
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