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Pentair FNS Plus Pool Filters

 
The culmination of 40 years of pool filter experience

Trap more dirt. Clean less often.  

The FNS PLUS filter's time-tested design offers you maximum performance, convenience, and reliability for year after year of sparkling clear pool enjoyment. With the FNS PLUS D.E. filter, you'll enjoy sparkling clear water from the most effective filtration system you can buy. And because they're designed to extend the time between cleanings, you can spend more time enjoying your pool instead of maintaining it

Filtering with diatomaceous earth (D.E.) results not just in clean water, but water that really sparkles. That's because D.E. filters remove particles as small as 3–5 microns.

Even though particles smaller than 40 microns can't be seen with the naked eye, large quantities of these microscopic contaminants have a very noticeable effect on water clarity. And D.E. strips them away. D.E. filters not only filter better, they can make your life easier...if two goals are met. First, is to maximize the filtration area. Because more filter area means much longer periods between cleanings.

Second, is to design a system that requires the least amount of pumping power to achieve a needed flow rate. Because lower pumping power means lower utility costs

That's why all Pentair D.E. filters feature curved D.E. grids to maximize surface area. It's why their internal design has been refined over decades to absolutely minimize flow restrictions. No wonder more than 2 million Pentair filters have been installed worldwide.

 

Key Benefits

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

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Attractive almond-colored tank blends into any backyard environment.

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Easily removable filter grid pack is secured by a single nut to simplify maintenance.

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 HIFLOW* manual air relief valve and continuous internal air relief eliminate air buildup from tank to maintain efficient filtration and prevent over-pressurization.

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Conveniently located 1-1/2" drain for easy and efficient cleanout.

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Unique internal design ensures optimal filtration and backwashing efficiency for longer runs between cleanings.

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Compatible with all sanitizing chemicals.

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Curved vertical grids provide maximum filter surface area for better cleaning.

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TENSION CONTROL* clamp for secure tank closure.

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Leak-proof plumbing connections.

 

FLOW RATE (1)
Product
Number
Sq. Ft.
Dim. A
Dim. B
FLOW
D.E.
Required
GPM
GPH
6hrs.
8hrs.
180006
24
37 in.
48 in.
48
2,880
17,280
23,040
2.4 lbs.
180007
36
43 in.
62 in.
72
4,320
25,920
34,560
3.6 lbs.
180008
48
49 in.
74 in.
96
5,760
34,560
46,080
4.8 lbs.
180009
60
55 in.
86 in.
120
7,200
43,200
57,600
6.0 lbs.
1. Flow rate is based on 2.0 GPM per sq. ft. of filter area. Actual system flow will depend on plumbing size and other system components

 

FILTER FAQ's 

Can I use Fiber Clear instead of the traditional D.E. in my FNS Plus Filter?
Yes, that is an acceptable filter media. However, we have found that it tends to need backwashing much more often than with D.E.
Where is the model number located on my Pentair filter?
The filter's model number and serial number are on the label on the filter tank. The label has a punched hole indicating the model number of the filter. 
I have a D.E. Filter. Why is it that every time I vacuum and run the filter, I have D.E. on the bottom of the pool an hour later?
It would be best to vacuum up the D.E. in the pool and then add D.E. if you know how much is in the filter after you do this. If you don't, then vacuum up the D.E., backwash the filter, and add approx. 80% of the total amount recommended on initial filter D.E. start up. Clean the filter grids well and look closely at them for any holes. The slightest hole can allow D.E. to go through the filter. Also, the manifold at the top should be examined closely for any cracks or holes. Lastly, check all pipes to see if their associated o-rings are ripped, torn or missing. Replace as needed. 
Why is dirt passing through my sand filter?
A number of things could be causing the problem. It could mean that a lateral is cracked or broken, or a valve may need servicing. Or, air may be passing through the filter, causing a channeling effect that permits dirt to get by the filter. In the latter case, there may be nothing wrong with the filter. 
What is the difference between the TRITON* C and the TRITON C-3 filters?
The difference between the TRITON* C and the TRITON C-3 is that the C is a standard bulkhead plumbing 2" connection and the C-3 is a 3" flanged connection. 
Is there any way of sealing a leak in a filter tank?
Unfortunately, there is no way to safely seal a leak in a filter tank. The best option is to replace the tank. 
I have a 10 year old sand filter. How can I determine if the sand needs to be replaced?
The general recommendation is to backwash your filter when the pressure reaches 10 psi over the initial start up pressure. For example, if the start up pressure is 15psi, you should backwash when the pressure reaches 25psi. If the pressure does not return to the start up pressure after backwashing, it is time to change the sand.